Here are some circuits that can convert an audio pulse/signal to CV signal.
They are used to send an audio signal from your DAW/Soundcard via the circuits, and into a Trigger unit or a CV input.
Probably best for feeding it with something like a kick drum, but might also yield interesting results with a dynamic guitar signal as well...
This first one is for units that has a trigger input (samplers, drum-machines and the like...):
And this one is for converting it to a CV signal: