wheelersounds

I'm trying to make my waveform cut off the signal until it reaches a certain power threshold, then keep the gate open until the signal reaches 0.

(excusing the ASCII) it would look something like this:

I would like the threshold to be adjustable.

I'm not very good at maths. Here's what I have so far...

I'm trying to make my waveform cut off the signal until it reaches a certain power threshold, then keep the gate open until the signal reaches 0. 

mimicing-the-distortion-of-a-diac-in-msp

http://www.opamp-electronics.com/tutorials/images/semiconductor/03214.png

Er, that didn't work. Here's an image:
http://www.opamp-electronics.com/tutorials/images/semiconductor/03214.png
