You inspired me to create this patch...
http://www.3amnoise.net/bounce_pulse.h2p
I'm running an envelope through the quantizer into the audio input of Filter 1 to ping the filter, Osc1 FMs Filter1 (depth controlled by Mod Wheel) and I'm using the Mixer feedback trick to overdrive Filter2 using the HPF output. With some simple adjustments (using velocity to change envelope rates) this can be a very dynamic patch. Small tweaks to the gain parameters for the filters can yield dramatic shifts in timbre but you'll risk breaking the patch.