Korg Mono/Poly

Hi Johan, Alain and all,

I have to admit it, I am a littler lost with modifications

Where could I get some infos to understand better about those  
modifications Johan wants to make?
Is there a book, a course (a secret potion)?

Many thanks in advance for your time in this

Sophie



On 11 Feb 2010, at 21:51, "Alain" <hubertalain@hotmail.com> wrote:

> Good mod choices, Johan.
> I like the CHD Elektro MIDI retrofit better than the Mungo. It's a  
> bit more expensive, but comes already complete and is a more elegant  
> solution for the MP. But that's only my personal opinion.
>
> A word of advice,if I may. When dealing with mods that concern the  
> VCOs, extra care must be taken, as those SSM2033 are close to  
> impossible to find as replacement chips, if ever a mod destroys one  
> (or more) of them.
>
> For this reason, I'd suggest starting with the filter mods. If ever  
> you inadvertently destroy the SSM2044, there are plenty available  
> (and inexpensive) on Ebay to replace it. Moreover, it is in a DIP  
> socket for easy removal. The SSM2033 are also in a socket, but have  
> their Tempco resistors glued on them and soldered to the main pcb.
>
> The LFO speed increase is entirely feasible, but also be aware that  
> doing so to MG2 might not trigger the arpeggiator correctly passed a  
> certain speed (cpu interrupt timing limitation).
>
> Sub-osc via divide is a great idea to get a little more "meat" out  
> of the low end.
>
> Do you have any schematics to start with, or are you going to  
> engineer them from scratch ?
>
> Alain.
>
> --- In korg_mono-poly@yahoogroups.com, "JohanI" <johan.inkinen@...>  
> wrote:
> >
> > Hi everyone! Thanks for the welcome! :)
> >
> > Well I've been thinking of doing these mods:
> >
> > VCO->Cutoff FM
> > VCO->VCA FM
> > VCO1->VCO(x) FM
> > LFO speeds increase by adding caps
> > Audio in -> VCF/VCA
> > Suboscillators via divide circuit to every square
> >
> > Oh, and also adding midi, either via Mungo Enterprises Midi  
> Retrofit or this one : http://www.chd-el.cz/index.php?id=409
> >
> > I consider myself a beginner in synthmodding, have done a couple  
> on the korg poly800 (moog slayer, 12/24db filterswitch, fm800 and so  
> on) and siel exp80 (similar architecture as poly800). Also working  
> on fitting the Mungo Enterprises midikit in a Juno6 atm.
> >
> >
> >
> > --- In korg_mono-poly@yahoogroups.com, "Alain" <hubertalain@> wrote:
> > >
> > > Yes Johan, welcome!
> > >
> > > I've already done a simple mod on mine, to convert arpeggiator  
> trigger input from s-trigger to pulse.
> > > I also plan to add a sample-and-hold with the clock source as  
> either MG1 or MG2...
> > >
> > > Tell us what you want to mod on your MP!
> > >
> > > Alain.
> > >
> > >
> > > --- In korg_mono-poly@yahoogroups.com, Florian Anwander  
> <fanwander@> wrote:
> > > >
> > > > Hello Johan,
> > > >
> > > > welcome to the group!
> > > >
> > > > Comment from new user:
> > > > > hello. i would like to do some modifications on my mp and  
> come here
> > > > > for help...
> > > >
> > > > Let us know what you want to modify.
> > > >
> > > > Florian
> > > >
> > >
> >
>
>