PAiA Fatman Modifications.

So I built a PAiA Fatman, and I'm currently addicted to it. In the process of rerecording all my previously digitally produced basslines, etc. However, like most people, I'm beginning to say "is this all I can do?" So the next FatMan I build, I am going to modify it.

So far I plan on having the subharmonic oscillator, the hard sync mod, the external input for the filter, either the repeating AR envelope or an actual LFO based of a flip flop or hex inverter circuit (for the filter, I'm not into VCO pitch shifting), and I might throw in a drive circuit and perhaps a 8 or 16 step sequencer.

Has anyone done any modifications to their Fatman? If so, which ones did you do, how smoothly did they go in terms on construction and implementation, and could you upload any samples for me to hear?

I know this forum is mainly geared for guitarists, so if necessary I'll move this thread over to the Keys forum. I just felt it belonged in the DIY section...