Prodigy mod: Adding hold switch...??

[Kim G. Hansen]

Brad Taylor wrote:
> 
> hello all:
> 
> i'm trying to add a "hold" switch to a moog prodigy with some success.
> using a multimeter i figured out where to wire the switch in to gate
> the  VCF/VCA (the connector that connects the keyboard with the
> mainboard). This seems to work with only one problem: when i switch "on"
> the gate and let go of a key, the vco sweeps towards a very high pitch.
> I assume this is because I didn't put a resistor on the "away from
> keyboard" side of the switch. yes? no?

Hello Brad !
I'm not that good with Ee-lec-tro-nicz ( yet ), but it seems to me 
that for your purposes it would be better to add the hold switch
between a constant current and the cv input to the VCA controlling the
output of your Prodigy..

- Anyway, i've got a readable copy of the Schematics/Service manual that i'd be
happy to copy for you and whoever else might want it.. 

Best, - Kim