Hi Silas
> Does a VCA output have an impedance
Of course :-). Each signal output has an impedance. It does not matter,
whether the signal is generated electromechanical by a microphone or
electronical by a synth module.
The impedance can be seen as the AC equivalent to a DC resistance which
could be determined by the voltage of the signal and the current that
flows when sending the signal (you rememeber good old Georg Ohm's law).
Florian