Synth-DIY Yahoo! Groups Archives

Mono/poly filter "glitching"

2011-06-26 by suicidesushi82

Hello.
I have been using my Mono/Poly a lot these last three months, and a couple of days ago it started to act up. When I haven't played it in a while (hours) the Low Pass Filter sounds a bit "overdrived" and the sound isn't consistent (shifting like the OSC's can't "push through"). After playing some notes and turning the cutoff and resonance pots, it finally settles and the problem is gone. As a reflex I bought a SSM2044 LPF IC in case anything was wrong with my filter.

Should I be worried? What could be wrong? Should I get it cleaned up?

Me and my band is VERY dependent on the mono/poly and a meltdown would be devastating.

Check out my music btw. It's all mono/poly :)

http://soundcloud.com/battlekat-music/the-pain

Thank's
Jeppe / Copenhagen

SV: [korg_mono-poly] Mono/poly filter "glitching"

2011-06-26 by thorbjørn nyander poulsen

Fra: suicidesushi82 <jeppe@fiftyfootspiders.dk>
Til: korg_mono-poly@yahoogroups.com
Sendt: 8:48 søndag den 26. juni 2011
Emne: [korg_mono-poly] Mono/poly filter "glitching"

Hello.
I have been using my Mono/Poly a lot these last three months, and a couple of days ago it started to act up. When I haven't played it in a while (hours) the Low Pass Filter sounds a bit "overdrived" and the sound isn't consistent (shifting like the OSC's can't "push through"). After playing some notes and turning the cutoff and resonance pots, it finally settles and the problem is gone. As a reflex I bought a SSM2044 LPF IC in case anything was wrong with my filter.

Should I be worried? What could be wrong? Should I get it cleaned up?

Me and my band is VERY dependent on the mono/poly and a meltdown would be devastating.

Check out my music btw. It's all mono/poly :)

http://soundcloud.com/battlekat-music/the-pain

Thank's
Jeppe / Copenhagen

Re: [korg_mono-poly] Mono/poly filter "glitching"

2011-06-26 by Florian Anwander

Hi Jeppe

Did you veryfy that it is NOT the output volume potentiometer?

it might(!) be caused by a oxidized cutoff potentiometer. If the
potentiometer has an oxyd layer and no voltage comes through It would
cut down the VCOs completely - new signal would "break its way" through
the oxyd layer. The same is valid for the output potentiometer.

Also the output of the VCO mixerstage might be corrupted. Try to
exchange IC18 (a 4558) and C8 (10uF,16V) on the VCO board.

You also may try to unsolder the 2044, insert an socket and try the
other 2044.

Florian

suicidesushi82 wrote:

>
> Hello.
> I have been using my Mono/Poly a lot these last three months, and a couple of days ago it started to act up. When I haven't played it in a while (hours) the Low Pass Filter sounds a bit "overdrived" and the sound isn't consistent (shifting like the OSC's can't "push through"). After playing some notes and turning the cutoff and resonance pots, it finally settles and the problem is gone. As a reflex I bought a SSM2044 LPF IC in case anything was wrong with my filter.
>
> Should I be worried? What could be wrong? Should I get it cleaned up?
>
> Me and my band is VERY dependent on the mono/poly and a meltdown would be devastating.
>
>
> Check out my music btw. It's all mono/poly :)
>
> http://soundcloud.com/battlekat-music/the-pain
>
> Thank's
> Jeppe / Copenhagen
>
>
>
> ------------------------------------
>
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