These few comments. Yes, save a place for an output module: Pico is a good compact module but others like Befaco also offer very good solutions. I agree with you regarding the presence of two filters, for a number of reasons including the positioning of voices in the sound spectrum. The 4ms Ensemble Oscillator is one of the best sound sources currently, not to be put in the same category as the Liquid Glitcher which is just a nice gadget.

'On ne devrait jamais quitter Montauban' (Fernand Naudin).
https://soundcloud.com/petrus-major/tracks