MOTM

On a related note (haha) this may be self evident, but I often put the VCA 
before the (LP) filter such that the harmonics from the severed bass wave 
gets filtered out. If I put it after the filter the VCA will cut those low 
notes off too quickly (or out of phase) creating a nice, clean, sharp 
square wave with harmonics all the way up the spectrum. Paul, you did say 
"fast" right? ;)

Anyone know how to setup a zero-crossing gate? Am I making sense?

2cents
--mikes