FatMan VCF External Input
Scott R. Gravenhorst 15-Apr-1996

This circuit is a simple interface to the FatMan's VCF.

The operational amplifier is any audio type.

Because the VCF feeds into the VCA, you must trigger the
FatMan or no sound will be produced.  For example, if you are
going to plug some kind of keyboard's sounds into the FatMan,
make sure that the Keyboard's MIDI channel is set to the same one
FatMan is using.  In this way, when a key is pressed on the
keyboard, it will trigger the FatMan and the envelope generator
internal to the FatMan will operate and modify the sound piped
into it.  I have even tried this with a MIDI guitar!

If you like external input, you should also modify the FatMan's mixer
so that you have a level control for each VCO.  This will allow you
to cut out both VCOs completely so that you can play with your
external input sound.

My current email address is chordman@ix.netcom.com