The other is changing the sound while the note is sounding.
Check out this Morpheus editor - this has been re-written for new Windows (post 3.1 !!) and also the source code is available.
This is my modified version where I have added an extra Midi input for keyboard to echo to the synth. You could use MidiOx to do the same thing, of course. I also added some dots to the 'pin patchboards' so I could see what I was changing a bit better.
All the best
Royce
