I would echo that having an audio input and triggerable Envs, also , more modulation input points (LFO rate, etc...) would be nice and more 'modular'.
Also-also, I miss the growl of XMF, maybe filter 2 could be an XMF?
As far as other modules, I would suggest a delay (for delay/flange/chorus/comb effects) and a nice distortion/shaper unit!
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