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hello, here's a mod for you:

hello, here's a mod for you:

2007-01-13 by Scott Deyo

hi group,

the m/p has a nice filter, eh?
howsabout putting some external audio through that?
i've had an m/p for a few years now, love it, and i've used my input a lot.
don't have the schems here, but here's the dealio:
find the schems!
find the opamp that sums the oscillators and noise before they go to the filter.
wire a jack to that opamp via a buffering cap and an attenuating pot.
if you don't understand any of that, find someone who does because you don't want to fry
your m/p (though i've only blown the fuses once :) or your other gear.
the nice thing about the m/p is that you can mix it w/ noise and/or any/all of the internal
VCOs!

clock your arpeggio w/ your drum machine or anything else, and turn up the key track
knob... sync'd filtering!

another fun trick:
plug another audio source into the m/p's FM input and get heterodyning fun!

another fun mod:
replace the MG caps with caps half the size.
use a spdt center-off switch to connect the original size and another larger size in parallel.
this way you get a normal/ faster/ slower switch.
at near-audio rates you can get great vocal-y sounds.
i'll post some audio when i'm done moving my studio.

by the by, if your filter or amp acts up, most likely it's your electrolyics in the ADSR(s).
replace them and you'll most likely be good to go. don't replace your expensive CEM or
whatever chip before you check the caps!

anyway, nice group, nice to talk to you, any input? plug it in!
scott
contact@bridechamber.com
www.bridechamber.com

Re: [korg_mono-poly] hello, here's a mod for you:

2007-01-14 by Florian Anwander

Hi Scott


> another fun mod:
> replace the MG caps with caps half the size.
> use a spdt center-off switch to connect the original size and another larger size in parallel.
> this way you get a normal/ faster/ slower switch.
> at near-audio rates you can get great vocal-y sounds.
Yes. I definitely can recommend this. The same is valid for the timing
caps of the envelopes (C23 and C25 resp on KLM355).

Regarding the timing of the envelopes: to my taste the range in which
the short attack, decay, and release rates are controlled by the
corresponging pots is very narrow, and theres a too wide range for the
long rates (e.g if I compare it to my moog prodigy). Did you ever think
about changing the potentiometers? Or adding parallel resistors to
change the characteristics of the potentiometers?


> by the by, if your filter or amp acts up, most likely it's your electrolyics in the ADSR(s).
> replace them and you'll most likely be good to go. don't replace your expensive CEM or
> whatever chip before you check the caps!
Theres a "must read" on this topic:
http://www.oldcrows.net/~oldcrow/synth/tips.txt

Florian

Re: [korg_mono-poly] hello, here's a mod for you:

2007-01-14 by contact@bridechamber.com

Hey Florian!
 
Thanks for the Old Crow link. I love his site, but never found this. I should change my power caps!
 
I've never tried changing the envelopes. That would be interesting.
 
I've tried some VCO FM mods using internal bits, but it never quite works like I want it to due to the complexity of the circuitry. Oh well.
 
Cheers,
Scott
 
----- Original Message -----
Sent: Sunday, January 14, 2007 11:42 AM
Subject: Re: [korg_mono-poly] hello, here's a mod for you:

Hi Scott

> another fun mod:
> replace the MG caps with caps half the size.
> use a spdt center-off switch to connect the original size and another larger size in parallel.
> this way you get a normal/ faster/ slower switch.
> at near-audio rates you can get great vocal-y sounds.
Yes. I definitely can recommend this. The same is valid for the timing
caps of the envelopes (C23 and C25 resp on KLM355).

Regarding the timing of the envelopes: to my taste the range in which
the short attack, decay, and release rates are controlled by the
corresponging pots is very narrow, and theres a too wide range for the
long rates (e.g if I compare it to my moog prodigy). Did you ever think
about changing the potentiometers? Or adding parallel resistors to
change the characteristics of the potentiometers?

> by the by, if your filter or amp acts up, most likely it's your electrolyics in the ADSR(s).
> replace them and you'll most likely be good to go. don't replace your expensive CEM or
> whatever chip before you check the caps!
Theres a "must read" on this topic:
http://www.oldcrows .net/~oldcrow/ synth/tips. txt

Florian

Re: [korg_mono-poly] hello, here's a mod for you:

2007-01-18 by Louis van Dompselaar

> Regarding the timing of the envelopes: to my taste the range in which
> the short attack, decay, and release rates are controlled by the
> corresponging pots is very narrow, and theres a too wide range for the
> long rates (e.g if I compare it to my moog prodigy). Did you ever think
> about changing the potentiometers? Or adding parallel resistors to
> change the characteristics of the potentiometers?

Yes, they feel to me to be log where they should be lin, or the other
way around. The service manual says they are log pots but I haven't
checked what's actually used in my M/P.

Louis