Chopped Oc-2 add-on

[wordstep]

To my knowledge, the 1st octave down and 2nd octave down output from 4013s are all close to square wave.
They are filtered to close to sine wav later, then mix.

In this thread, you can find some info about the filtering.
http://archive.ampage.org/threads/1/fxgd/037584/Hold_up_at_2nd_base-1.html

Good luck with your project.