I'm quite new in this synth world. I have a complete AE system And it works great. I'm trying now to process external audio through the synth. A question I have is, an external audio signal does create a gate or trigger as well as some cv to be managed with through the synth (i.e to create an envelope for a guitar sound or to use it in a sample&hold or logic module)
I'm not sure what your question is exactly, do you want to generate gate and CV signal from audio ? If so it sounds like you are looking for an envelope follower, unfortunately there isn't any yet available for AE.
EDIT : Actually careck is right, the SLEW/EDGE can be used as an envelope follower, I had forgotten that