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Discussion about the Korg PolySix synthesizer

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VCF cutoff quirkiness

VCF cutoff quirkiness

2004-07-20 by dizz662000

Hi,  this is my my first post to this group. I bought a Polysix
recently   realizing they're very old. Actually played guitar mainly
in the 80's but there was always a PSix in my basement studio.
Background: this unit had maintenance performed by Korg in the 80's
and the battery was lifted into a socket before any damage occurred.
It works pretty good except; I noticed some volume issues (not being
very responsive to cranking it up!) I believe I solved this issue by
working the volume pot a few times-maybe a scratchy pot in need of
cleaning. More importantly, there's an issue with the VCF cutoff. It
doesn't track well when at the lower freqs. When I move the knob it
sounds like it's dirty and cuts in and out. When it's stationary (not
moving) the freq cuts off where it should. Just to be clear, I can set
it any where and get the correct cutoff, it just takes some tweaking
at the lower end. This again sounds like maybe a dirty pot. I have
heard that the filter chip set may be going?? Not a tech head myself.
Sorry for being longwinded but I need to keep this dinosaur roaring!!
 Any feedback would be appreciated

Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by BrainSlayer

if the filter chip would be the source of that issue, you would only hear it at one of the six voices and not at all. so be sure it isnt the filter.
Show quoted textHide quoted text
  ----- Original Message ----- 
  From: dizz662000 
  To: PolySix@yahoogroups.com 
  Sent: Tuesday, July 20, 2004 4:27 AM
  Subject: [PolySix] VCF cutoff quirkiness


  Hi,  this is my my first post to this group. I bought a Polysix
  recently   realizing they're very old. Actually played guitar mainly
  in the 80's but there was always a PSix in my basement studio.
  Background: this unit had maintenance performed by Korg in the 80's
  and the battery was lifted into a socket before any damage occurred.
  It works pretty good except; I noticed some volume issues (not being
  very responsive to cranking it up!) I believe I solved this issue by
  working the volume pot a few times-maybe a scratchy pot in need of
  cleaning. More importantly, there's an issue with the VCF cutoff. It
  doesn't track well when at the lower freqs. When I move the knob it
  sounds like it's dirty and cuts in and out. When it's stationary (not
  moving) the freq cuts off where it should. Just to be clear, I can set
  it any where and get the correct cutoff, it just takes some tweaking
  at the lower end. This again sounds like maybe a dirty pot. I have
  heard that the filter chip set may be going?? Not a tech head myself.
  Sorry for being longwinded but I need to keep this dinosaur roaring!!
  Any feedback would be appreciated




  PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 


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Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by dizz@elitemofo.com

Hi brainslayer,

  Thanks for the quick reply. Just to make sure I understand you correctly, If
it were the chip itself I would hear it only in poly and not unison mode? Or,
are you saying hold down six notes in poly mode and it would affect only one of
the notes? My apologies if I'm being thick-headed here.

dizz

Quoting BrainSlayer <brainslayer@c-u-d.de>:
Show quoted textHide quoted text
> if the filter chip would be the source of that issue, you would only hear it
> at one of the six voices and not at all. so be sure it isnt the filter.
>   ----- Original Message -----
>   From: dizz662000
>   To: PolySix@yahoogroups.com
>   Sent: Tuesday, July 20, 2004 4:27 AM
>   Subject: [PolySix] VCF cutoff quirkiness
>
>
>   Hi,  this is my my first post to this group. I bought a Polysix
>   recently   realizing they're very old. Actually played guitar mainly
>   in the 80's but there was always a PSix in my basement studio.
>   Background: this unit had maintenance performed by Korg in the 80's
>   and the battery was lifted into a socket before any damage occurred.
>   It works pretty good except; I noticed some volume issues (not being
>   very responsive to cranking it up!) I believe I solved this issue by
>   working the volume pot a few times-maybe a scratchy pot in need of
>   cleaning. More importantly, there's an issue with the VCF cutoff. It
>   doesn't track well when at the lower freqs. When I move the knob it
>   sounds like it's dirty and cuts in and out. When it's stationary (not
>   moving) the freq cuts off where it should. Just to be clear, I can set
>   it any where and get the correct cutoff, it just takes some tweaking
>   at the lower end. This again sounds like maybe a dirty pot. I have
>   heard that the filter chip set may be going?? Not a tech head myself.
>   Sorry for being longwinded but I need to keep this dinosaur roaring!!
>   Any feedback would be appreciated
>
>
>
>
>   PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>
>
>         Yahoo! Groups Sponsor
>               ADVERTISEMENT
>
>
>
>
>
> ------------------------------------------------------------------------------
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>     http://groups.yahoo.com/group/PolySix/
>
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>     PolySix-unsubscribe@yahoogroups.com
>
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>
>
> [Non-text portions of this message have been removed]
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> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
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Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by BrainSlayer

there are six filter chips on the board. 1 for each voice. if you press one note it would only use 1 of them. if you release the note and pressing another key, another voice (not the same) will be played. so if you trigger 6 keys in just a normal order you can identify the damage voice if. if you open the case you will see that a little led is lighted up for each voice that is played (so in fact there are 6 red led's bellow the filter chips)
just enable the arpeggator and set a slow arpeggio speed. then you will see that the 6 led 's are blinking in a linear order. (this works only in poly mode, on unisono all led's are lighting up)


Sebastian
Show quoted textHide quoted text
  ----- Original Message ----- 
  From: dizz@elitemofo.com 
  To: PolySix@yahoogroups.com 
  Sent: Tuesday, July 20, 2004 6:38 PM
  Subject: Re: [PolySix] VCF cutoff quirkiness


  Hi brainslayer,

    Thanks for the quick reply. Just to make sure I understand you correctly, If
  it were the chip itself I would hear it only in poly and not unison mode? Or,
  are you saying hold down six notes in poly mode and it would affect only one of
  the notes? My apologies if I'm being thick-headed here.

  dizz

  Quoting BrainSlayer <brainslayer@c-u-d.de>:

  > if the filter chip would be the source of that issue, you would only hear it
  > at one of the six voices and not at all. so be sure it isnt the filter.
  >   ----- Original Message -----
  >   From: dizz662000
  >   To: PolySix@yahoogroups.com
  >   Sent: Tuesday, July 20, 2004 4:27 AM
  >   Subject: [PolySix] VCF cutoff quirkiness
  >
  >
  >   Hi,  this is my my first post to this group. I bought a Polysix
  >   recently   realizing they're very old. Actually played guitar mainly
  >   in the 80's but there was always a PSix in my basement studio.
  >   Background: this unit had maintenance performed by Korg in the 80's
  >   and the battery was lifted into a socket before any damage occurred.
  >   It works pretty good except; I noticed some volume issues (not being
  >   very responsive to cranking it up!) I believe I solved this issue by
  >   working the volume pot a few times-maybe a scratchy pot in need of
  >   cleaning. More importantly, there's an issue with the VCF cutoff. It
  >   doesn't track well when at the lower freqs. When I move the knob it
  >   sounds like it's dirty and cuts in and out. When it's stationary (not
  >   moving) the freq cuts off where it should. Just to be clear, I can set
  >   it any where and get the correct cutoff, it just takes some tweaking
  >   at the lower end. This again sounds like maybe a dirty pot. I have
  >   heard that the filter chip set may be going?? Not a tech head myself.
  >   Sorry for being longwinded but I need to keep this dinosaur roaring!!
  >   Any feedback would be appreciated
  >
  >
  >
  >
  >   PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
  >
  >
  >         Yahoo! Groups Sponsor
  >               ADVERTISEMENT
  >
  >
  >
  >
  >
  > ------------------------------------------------------------------------------
  >   Yahoo! Groups Links
  >
  >     a.. To visit your group on the web, go to:
  >     http://groups.yahoo.com/group/PolySix/
  >
  >     b.. To unsubscribe from this group, send an email to:
  >     PolySix-unsubscribe@yahoogroups.com
  >
  >     c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
  >
  >
  >
  > [Non-text portions of this message have been removed]
  >
  >
  >
  >
  > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
  > Yahoo! Groups Links
  >
  >
  >
  >
  >
  >





  PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 


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[Non-text portions of this message have been removed]

Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by dizz@elitemofo.com

I'll pull the cover and have a look. So if one filter was bad, the LED and it's
corresponding voice wouldn't work? Thanks for your extreme patience with a
not-so-technical person. I sincerely appreciate the help!

dizz

Quoting BrainSlayer <brainslayer@c-u-d.de>:
Show quoted textHide quoted text
> there are six filter chips on the board. 1 for each voice. if you press one
> note it would only use 1 of them. if you release the note and pressing
> another key, another voice (not the same) will be played. so if you trigger 6
> keys in just a normal order you can identify the damage voice if. if you open
> the case you will see that a little led is lighted up for each voice that is
> played (so in fact there are 6 red led's bellow the filter chips)
> just enable the arpeggator and set a slow arpeggio speed. then you will see
> that the 6 led 's are blinking in a linear order. (this works only in poly
> mode, on unisono all led's are lighting up)
>
>
> Sebastian
>   ----- Original Message -----
>   From: dizz@elitemofo.com
>   To: PolySix@yahoogroups.com
>   Sent: Tuesday, July 20, 2004 6:38 PM
>   Subject: Re: [PolySix] VCF cutoff quirkiness
>
>
>   Hi brainslayer,
>
>     Thanks for the quick reply. Just to make sure I understand you correctly,
> If
>   it were the chip itself I would hear it only in poly and not unison mode?
> Or,
>   are you saying hold down six notes in poly mode and it would affect only
> one of
>   the notes? My apologies if I'm being thick-headed here.
>
>   dizz
>
>   Quoting BrainSlayer <brainslayer@c-u-d.de>:
>
>   > if the filter chip would be the source of that issue, you would only hear
> it
>   > at one of the six voices and not at all. so be sure it isnt the filter.
>   >   ----- Original Message -----
>   >   From: dizz662000
>   >   To: PolySix@yahoogroups.com
>   >   Sent: Tuesday, July 20, 2004 4:27 AM
>   >   Subject: [PolySix] VCF cutoff quirkiness
>   >
>   >
>   >   Hi,  this is my my first post to this group. I bought a Polysix
>   >   recently   realizing they're very old. Actually played guitar mainly
>   >   in the 80's but there was always a PSix in my basement studio.
>   >   Background: this unit had maintenance performed by Korg in the 80's
>   >   and the battery was lifted into a socket before any damage occurred.
>   >   It works pretty good except; I noticed some volume issues (not being
>   >   very responsive to cranking it up!) I believe I solved this issue by
>   >   working the volume pot a few times-maybe a scratchy pot in need of
>   >   cleaning. More importantly, there's an issue with the VCF cutoff. It
>   >   doesn't track well when at the lower freqs. When I move the knob it
>   >   sounds like it's dirty and cuts in and out. When it's stationary (not
>   >   moving) the freq cuts off where it should. Just to be clear, I can set
>   >   it any where and get the correct cutoff, it just takes some tweaking
>   >   at the lower end. This again sounds like maybe a dirty pot. I have
>   >   heard that the filter chip set may be going?? Not a tech head myself.
>   >   Sorry for being longwinded but I need to keep this dinosaur roaring!!
>   >   Any feedback would be appreciated
>   >
>   >
>   >
>   >
>   >   PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>   >
>   >
>   >         Yahoo! Groups Sponsor
>   >               ADVERTISEMENT
>   >
>   >
>   >
>   >
>   >
>   >
> ------------------------------------------------------------------------------
>   >   Yahoo! Groups Links
>   >
>   >     a.. To visit your group on the web, go to:
>   >     http://groups.yahoo.com/group/PolySix/
>   >
>   >     b.. To unsubscribe from this group, send an email to:
>   >     PolySix-unsubscribe@yahoogroups.com
>   >
>   >     c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> Service.
>   >
>   >
>   >
>   > [Non-text portions of this message have been removed]
>   >
>   >
>   >
>   >
>   > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>   > Yahoo! Groups Links
>   >
>   >
>   >
>   >
>   >
>   >
>
>
>
>
>
>   PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>
>
>         Yahoo! Groups Sponsor
>               ADVERTISEMENT
>
>
>
>
>
> ------------------------------------------------------------------------------
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>
>     a.. To visit your group on the web, go to:
>     http://groups.yahoo.com/group/PolySix/
>
>     b.. To unsubscribe from this group, send an email to:
>     PolySix-unsubscribe@yahoogroups.com
>
>     c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>

Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by Chromatest J. Pantsmaker

No no...  basically, they are saying that the filter probably isn't bad.  There are 6 discrete filters, one for each voice.  If when you play 6 notes in a row (middle C pressed 6 times for example) they all sound the same (bad) there are two options.  One option is that ALL 6 filter chips are bad, or it's not the filters.  Since it would be pretty strange that all 6 filter chips would be bad, you probably don't need to worry about them.

Either the bad sound is coming from some sort of weird setting that is telling the voices to make the sound, or there is something wrong after the 6 voices are combined together.

Now if you only had one note of the 6 pressed that sounded bad, then it must be something on that voice, whether the VCO or VCF or related circuitry...

Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by dizz@elitemofo.com

OK-that makes things a bit more clear. I didn't think it would be the filters
because I can reproduce all of the original presets (a wide range of sounds and
very cheesy I might add). It's just when I tweak the cutoff, it seems to cut
out at spots, mainly toward the lower freqs. It acts just like a dirty pot on a
guitar etc. I think I'll try to clean it out if possible. The KLM 370 looks
easy to remove. I haven't actually had the cover off yet, but do you know if
the pots can be cleaned out? Or are they sealed?  The Psix is an awesome
compliment to my Moog and MS2K etc,,, I think I have a pretty good one judging
from some of the horror stories regarding battery damage. Thanks a bunch for
all the help!!

dizz

Quoting "Chromatest J. Pantsmaker" <chromatest@graffiti.net>:
Show quoted textHide quoted text
> No no...  basically, they are saying that the filter probably isn't bad.
> There are 6 discrete filters, one for each voice.  If when you play 6 notes
> in a row (middle C pressed 6 times for example) they all sound the same (bad)
> there are two options.  One option is that ALL 6 filter chips are bad, or
> it's not the filters.  Since it would be pretty strange that all 6 filter
> chips would be bad, you probably don't need to worry about them.
>
> Either the bad sound is coming from some sort of weird setting that is
> telling the voices to make the sound, or there is something wrong after the 6
> voices are combined together.
>
> Now if you only had one note of the 6 pressed that sounded bad, then it must
> be something on that voice, whether the VCO or VCF or related circuitry...
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>

Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by BrainSlayer

the led only indicates that the voice is playing. but not if some error is inside. if one of the led isnt working, a voice is damaged. thats all. if the distortion affects all voices. you must search for another problem. i already sayed that it is possible to distort the sounds with some lfo settings (frequency modulation at full lfo speed) 
another source would be the effects (chorus,phaser etc) section. these effects are routet after the voices and they are global too. it surelly would be easier if you can record this effect with an instruction which settings you are using. so maybe i can tweak my polysix to sound like the same. i can also hear if your pre amplifer is damage which is possible too. this will result in an very distorted sound in the most cases (like crackling in a high frequency)
Show quoted textHide quoted text
  ----- Original Message ----- 
  From: dizz@elitemofo.com 
  To: PolySix@yahoogroups.com 
  Sent: Tuesday, July 20, 2004 9:24 PM
  Subject: Re: [PolySix] VCF cutoff quirkiness


  I'll pull the cover and have a look. So if one filter was bad, the LED and it's
  corresponding voice wouldn't work? Thanks for your extreme patience with a
  not-so-technical person. I sincerely appreciate the help!

  dizz

  Quoting BrainSlayer <brainslayer@c-u-d.de>:

  > there are six filter chips on the board. 1 for each voice. if you press one
  > note it would only use 1 of them. if you release the note and pressing
  > another key, another voice (not the same) will be played. so if you trigger 6
  > keys in just a normal order you can identify the damage voice if. if you open
  > the case you will see that a little led is lighted up for each voice that is
  > played (so in fact there are 6 red led's bellow the filter chips)
  > just enable the arpeggator and set a slow arpeggio speed. then you will see
  > that the 6 led 's are blinking in a linear order. (this works only in poly
  > mode, on unisono all led's are lighting up)
  >
  >
  > Sebastian
  >   ----- Original Message -----
  >   From: dizz@elitemofo.com
  >   To: PolySix@yahoogroups.com
  >   Sent: Tuesday, July 20, 2004 6:38 PM
  >   Subject: Re: [PolySix] VCF cutoff quirkiness
  >
  >
  >   Hi brainslayer,
  >
  >     Thanks for the quick reply. Just to make sure I understand you correctly,
  > If
  >   it were the chip itself I would hear it only in poly and not unison mode?
  > Or,
  >   are you saying hold down six notes in poly mode and it would affect only
  > one of
  >   the notes? My apologies if I'm being thick-headed here.
  >
  >   dizz
  >
  >   Quoting BrainSlayer <brainslayer@c-u-d.de>:
  >
  >   > if the filter chip would be the source of that issue, you would only hear
  > it
  >   > at one of the six voices and not at all. so be sure it isnt the filter.
  >   >   ----- Original Message -----
  >   >   From: dizz662000
  >   >   To: PolySix@yahoogroups.com
  >   >   Sent: Tuesday, July 20, 2004 4:27 AM
  >   >   Subject: [PolySix] VCF cutoff quirkiness
  >   >
  >   >
  >   >   Hi,  this is my my first post to this group. I bought a Polysix
  >   >   recently   realizing they're very old. Actually played guitar mainly
  >   >   in the 80's but there was always a PSix in my basement studio.
  >   >   Background: this unit had maintenance performed by Korg in the 80's
  >   >   and the battery was lifted into a socket before any damage occurred.
  >   >   It works pretty good except; I noticed some volume issues (not being
  >   >   very responsive to cranking it up!) I believe I solved this issue by
  >   >   working the volume pot a few times-maybe a scratchy pot in need of
  >   >   cleaning. More importantly, there's an issue with the VCF cutoff. It
  >   >   doesn't track well when at the lower freqs. When I move the knob it
  >   >   sounds like it's dirty and cuts in and out. When it's stationary (not
  >   >   moving) the freq cuts off where it should. Just to be clear, I can set
  >   >   it any where and get the correct cutoff, it just takes some tweaking
  >   >   at the lower end. This again sounds like maybe a dirty pot. I have
  >   >   heard that the filter chip set may be going?? Not a tech head myself.
  >   >   Sorry for being longwinded but I need to keep this dinosaur roaring!!
  >   >   Any feedback would be appreciated
  >   >
  >   >
  >   >
  >   >
  >   >   PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
  >   >
  >   >
  >   >         Yahoo! Groups Sponsor
  >   >               ADVERTISEMENT
  >   >
  >   >
  >   >
  >   >
  >   >
  >   >
  > ------------------------------------------------------------------------------
  >   >   Yahoo! Groups Links
  >   >
  >   >     a.. To visit your group on the web, go to:
  >   >     http://groups.yahoo.com/group/PolySix/
  >   >
  >   >     b.. To unsubscribe from this group, send an email to:
  >   >     PolySix-unsubscribe@yahoogroups.com
  >   >
  >   >     c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of
  > Service.
  >   >
  >   >
  >   >
  >   > [Non-text portions of this message have been removed]
  >   >
  >   >
  >   >
  >   >
  >   > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
  >   > Yahoo! Groups Links
  >   >
  >   >
  >   >
  >   >
  >   >
  >   >
  >
  >
  >
  >
  >
  >   PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
  >
  >
  >         Yahoo! Groups Sponsor
  >               ADVERTISEMENT
  >
  >
  >
  >
  >
  > ------------------------------------------------------------------------------
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  >
  >     a.. To visit your group on the web, go to:
  >     http://groups.yahoo.com/group/PolySix/
  >
  >     b.. To unsubscribe from this group, send an email to:
  >     PolySix-unsubscribe@yahoogroups.com
  >
  >     c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
  >
  >
  >
  > [Non-text portions of this message have been removed]
  >
  >
  >
  >
  > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
  > Yahoo! Groups Links
  >
  >
  >
  >
  >
  >





  PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 


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[Non-text portions of this message have been removed]

Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by BrainSlayer

its really easy to remove all of the boards. nothing is really sealed. just remove the screws from the pots on the topside and remove the screws from the board. some wire connections are sealed with a little bit (not hard to break) glue. but thats really all. all components are easy to compose and decompose
Show quoted textHide quoted text
  ----- Original Message ----- 
  From: dizz@elitemofo.com 
  To: PolySix@yahoogroups.com 
  Sent: Tuesday, July 20, 2004 10:23 PM
  Subject: Re: [PolySix] VCF cutoff quirkiness


  OK-that makes things a bit more clear. I didn't think it would be the filters
  because I can reproduce all of the original presets (a wide range of sounds and
  very cheesy I might add). It's just when I tweak the cutoff, it seems to cut
  out at spots, mainly toward the lower freqs. It acts just like a dirty pot on a
  guitar etc. I think I'll try to clean it out if possible. The KLM 370 looks
  easy to remove. I haven't actually had the cover off yet, but do you know if
  the pots can be cleaned out? Or are they sealed?  The Psix is an awesome
  compliment to my Moog and MS2K etc,,, I think I have a pretty good one judging
  from some of the horror stories regarding battery damage. Thanks a bunch for
  all the help!!

  dizz

  Quoting "Chromatest J. Pantsmaker" <chromatest@graffiti.net>:

  > No no...  basically, they are saying that the filter probably isn't bad.
  > There are 6 discrete filters, one for each voice.  If when you play 6 notes
  > in a row (middle C pressed 6 times for example) they all sound the same (bad)
  > there are two options.  One option is that ALL 6 filter chips are bad, or
  > it's not the filters.  Since it would be pretty strange that all 6 filter
  > chips would be bad, you probably don't need to worry about them.
  >
  > Either the bad sound is coming from some sort of weird setting that is
  > telling the voices to make the sound, or there is something wrong after the 6
  > voices are combined together.
  >
  > Now if you only had one note of the 6 pressed that sounded bad, then it must
  > be something on that voice, whether the VCO or VCF or related circuitry...
  >
  >
  >
  >
  > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
  > Yahoo! Groups Links
  >
  >
  >
  >
  >
  >





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[Non-text portions of this message have been removed]

Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by dizz@elitemofo.com

Thanks again Brain. I'll let you know how I turn out.

dizz

Quoting BrainSlayer <brainslayer@c-u-d.de>:
Show quoted textHide quoted text
> its really easy to remove all of the boards. nothing is really sealed. just
> remove the screws from the pots on the topside and remove the screws from the
> board. some wire connections are sealed with a little bit (not hard to break)
> glue. but thats really all. all components are easy to compose and decompose
>   ----- Original Message -----
>   From: dizz@elitemofo.com
>   To: PolySix@yahoogroups.com
>   Sent: Tuesday, July 20, 2004 10:23 PM
>   Subject: Re: [PolySix] VCF cutoff quirkiness
>
>
>   OK-that makes things a bit more clear. I didn't think it would be the
> filters
>   because I can reproduce all of the original presets (a wide range of sounds
> and
>   very cheesy I might add). It's just when I tweak the cutoff, it seems to
> cut
>   out at spots, mainly toward the lower freqs. It acts just like a dirty pot
> on a
>   guitar etc. I think I'll try to clean it out if possible. The KLM 370 looks
>   easy to remove. I haven't actually had the cover off yet, but do you know
> if
>   the pots can be cleaned out? Or are they sealed?  The Psix is an awesome
>   compliment to my Moog and MS2K etc,,, I think I have a pretty good one
> judging
>   from some of the horror stories regarding battery damage. Thanks a bunch
> for
>   all the help!!
>
>   dizz
>
>   Quoting "Chromatest J. Pantsmaker" <chromatest@graffiti.net>:
>
>   > No no...  basically, they are saying that the filter probably isn't bad.
>   > There are 6 discrete filters, one for each voice.  If when you play 6
> notes
>   > in a row (middle C pressed 6 times for example) they all sound the same
> (bad)
>   > there are two options.  One option is that ALL 6 filter chips are bad, or
>   > it's not the filters.  Since it would be pretty strange that all 6 filter
>   > chips would be bad, you probably don't need to worry about them.
>   >
>   > Either the bad sound is coming from some sort of weird setting that is
>   > telling the voices to make the sound, or there is something wrong after
> the 6
>   > voices are combined together.
>   >
>   > Now if you only had one note of the 6 pressed that sounded bad, then it
> must
>   > be something on that voice, whether the VCO or VCF or related
> circuitry...
>   >
>   >
>   >
>   >
>   > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>   > Yahoo! Groups Links
>   >
>   >
>   >
>   >
>   >
>   >
>
>
>
>
>
>   PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>
>
>         Yahoo! Groups Sponsor
>               ADVERTISEMENT
>
>
>
>
>
> ------------------------------------------------------------------------------
>   Yahoo! Groups Links
>
>     a.. To visit your group on the web, go to:
>     http://groups.yahoo.com/group/PolySix/
>
>     b.. To unsubscribe from this group, send an email to:
>     PolySix-unsubscribe@yahoogroups.com
>
>     c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>

Re: [PolySix] VCF cutoff quirkiness

2004-07-20 by The Old Crow

Hi,

  You should check the output voltage on the wiper contact of the filter 
cutoff potentiometer.  It should read +5V at maximum and -5V at minimum 
rotation.  See what the reading is when the knob is set to a 'trouble' 
spot.  That will help determine if the pot itself is dirty.

Crow
/**/

Re: [PolySix] VCF cutoff quirkiness

2004-07-21 by dizz@elitemofo.com

Master Crow,

  Thank you for responding and please forgive my ignorance. I can do this if
it's just a matter of checking the voltage across the pot leads with a
multimeter. Otherwise I'd need specific info. If it requires special test
equip. I'd probably have to have an expert (such as yourself!) look at it.
Whatever it takes. FYI the trouble spot seems to be arounnd #2, or 9:00
o'clock. If I set it and leave it alone, it seems fine and cuts the freq. off
where it should. I've programmed and stored many different sounding patches,
that's why it seems to me that the filters are working properly. Anyway, just
speculation. Again thanks for the help.

dizz

Quoting The Old Crow <oldcrow@oldcrows.net>:
Show quoted textHide quoted text
>
>   Hi,
>
>   You should check the output voltage on the wiper contact of the filter
> cutoff potentiometer.  It should read +5V at maximum and -5V at minimum
> rotation.  See what the reading is when the knob is set to a 'trouble'
> spot.  That will help determine if the pot itself is dirty.
>
> Crow
> /**/
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>

Re: [PolySix] VCF cutoff quirkiness

2004-09-14 by dizz@elitemofo.com

Crow,

  After cleaning the pot out with some contact cleaner the problem has improved
by appr. 50%. I believe it just hadn't been used in a while.
  I finally got a decent DMM and measured the voltage on the pot. However, I
don't see any negative voltage unless I reverse the leads. It reads 0V at
minimum and sweeps up to 9.92V at the max rotation. In the trouble spot, the
meter reads "overload" briefly and quickly continues measuring correctly after
resuming the rotation. Any suggestions would be greatly appreciated!

dizz

Quoting The Old Crow <oldcrow@oldcrows.net>:
Show quoted textHide quoted text
>
>   Hi,
>
>   You should check the output voltage on the wiper contact of the filter
> cutoff potentiometer.  It should read +5V at maximum and -5V at minimum
> rotation.  See what the reading is when the knob is set to a 'trouble'
> spot.  That will help determine if the pot itself is dirty.
>
> Crow
> /**/
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>

Re: [PolySix] VCF cutoff quirkiness

2004-09-14 by The Old Crow

Hm, that sounds like a pot with a cracked element.  It will have to be 
replaced, unfortunately.  You need to measure from the middle pot pin to 
ground to see the -5 to +5 volts.

Crow
/**/
Show quoted textHide quoted text
On Tue, 14 Sep 2004 dizz@elitemofo.com wrote:

> Crow,
> 
>   After cleaning the pot out with some contact cleaner the problem has
> improved by appr. 50%. I believe it just hadn't been used in a while.
>   I finally got a decent DMM and measured the voltage on the pot.
> However, I don't see any negative voltage unless I reverse the leads. It
> reads 0V at minimum and sweeps up to 9.92V at the max rotation. In the
> trouble spot, the meter reads "overload" briefly and quickly continues
> measuring correctly after resuming the rotation. Any suggestions would
> be greatly appreciated!
> 
> dizz

Re: [PolySix] VCF cutoff quirkiness

2004-09-14 by dizz@elitemofo.com

Thanks Crow,

  Yep, I'm thinking bad pot too. I'll try the measurements again. Can you tell
me where to get a replacement that's close to the original? I've heard you
mention jameco.com  Looks like I need a 10K Ohm -5V to +5V linear type correct?

regards,

dizz

Quoting The Old Crow <oldcrow@oldcrows.net>:
Show quoted textHide quoted text
>
>   Hm, that sounds like a pot with a cracked element.  It will have to be
> replaced, unfortunately.  You need to measure from the middle pot pin to
> ground to see the -5 to +5 volts.
>
> Crow
> /**/
>
> On Tue, 14 Sep 2004 dizz@elitemofo.com wrote:
>
> > Crow,
> >
> >   After cleaning the pot out with some contact cleaner the problem has
> > improved by appr. 50%. I believe it just hadn't been used in a while.
> >   I finally got a decent DMM and measured the voltage on the pot.
> > However, I don't see any negative voltage unless I reverse the leads. It
> > reads 0V at minimum and sweeps up to 9.92V at the max rotation. In the
> > trouble spot, the meter reads "overload" briefly and quickly continues
> > measuring correctly after resuming the rotation. Any suggestions would
> > be greatly appreciated!
> >
> > dizz
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>

Re: [PolySix] VCF cutoff quirkiness

2004-09-14 by The Old Crow

Actually, those pots might be hard to find.  I'll have to see if I can 
locate the manufacturer.  You might have to use a close-but-not-exact pot 
model.

Crow
/**/
Show quoted textHide quoted text
On Tue, 14 Sep 2004 dizz@elitemofo.com wrote:

> Thanks Crow,
> 
>   Yep, I'm thinking bad pot too. I'll try the measurements again. Can
> you tell me where to get a replacement that's close to the original?
> I've heard you mention jameco.com Looks like I need a 10K Ohm -5V to +5V
> linear type correct?
> 
> regards,
> 
> dizz
> 
> Quoting The Old Crow <oldcrow@oldcrows.net>:
> 
> >
> >   Hm, that sounds like a pot with a cracked element.  It will have to be
> > replaced, unfortunately.  You need to measure from the middle pot pin to
> > ground to see the -5 to +5 volts.

Re: [PolySix] VCF cutoff quirkiness

2004-09-14 by dizz@elitemofo.com

I was expecting to hear that. I'll check around as well but you're more savvy
than I. Are those specs in order?  Please let me know if you find something
close.

dizz

Quoting The Old Crow <oldcrow@oldcrows.net>:
Show quoted textHide quoted text
>
>   Actually, those pots might be hard to find.  I'll have to see if I can
> locate the manufacturer.  You might have to use a close-but-not-exact pot
> model.
>
> Crow
> /**/
>
> On Tue, 14 Sep 2004 dizz@elitemofo.com wrote:
>
> > Thanks Crow,
> >
> >   Yep, I'm thinking bad pot too. I'll try the measurements again. Can
> > you tell me where to get a replacement that's close to the original?
> > I've heard you mention jameco.com Looks like I need a 10K Ohm -5V to +5V
> > linear type correct?
> >
> > regards,
> >
> > dizz
> >
> > Quoting The Old Crow <oldcrow@oldcrows.net>:
> >
> > >
> > >   Hm, that sounds like a pot with a cracked element.  It will have to be
> > > replaced, unfortunately.  You need to measure from the middle pot pin to
> > > ground to see the -5 to +5 volts.
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>

Re: [PolySix] VCF cutoff quirkiness

2004-09-14 by The Old Crow

Well, it is a 10K linear taper type.  The voltage is not really part of 
the rating, although it will have a maximum power rating which is not 
important here as the device is not passing heavy currents.

  The two key things you need to match up are the threading bushing size 
and the PCB mounting pins.

Crow
/**/
Show quoted textHide quoted text
On Tue, 14 Sep 2004 dizz@elitemofo.com wrote:

> I was expecting to hear that. I'll check around as well but you're more
> savvy than I. Are those specs in order?  Please let me know if you find
> something close.
> 
> dizz

Re: [PolySix] VCF cutoff quirkiness

2004-09-14 by dizz@elitemofo.com

Thanks Crow,

  If you can find something please let me know.

dizz

Quoting The Old Crow <oldcrow@oldcrows.net>:
Show quoted textHide quoted text
>
>   Well, it is a 10K linear taper type.  The voltage is not really part of
> the rating, although it will have a maximum power rating which is not
> important here as the device is not passing heavy currents.
>
>   The two key things you need to match up are the threading bushing size
> and the PCB mounting pins.
>
> Crow
> /**/
>
> On Tue, 14 Sep 2004 dizz@elitemofo.com wrote:
>
> > I was expecting to hear that. I'll check around as well but you're more
> > savvy than I. Are those specs in order?  Please let me know if you find
> > something close.
> >
> > dizz
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>

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