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
> > >
> >
>