The end game for this 6U rig is a fully loaded, dual-timbral/dual-voice synthesizer. I'm omitting sampling, sequencing and discrete percussion modules in favor of CV & audio modulation. Those functions will be taken care of either externally or in my next 6U rig.
The SynthTech E350 and the Neutron Sound Orgone Accumulator are my two primary timbre modules. NoiseRing, Dr. Octature II, PEAKS, and Sallen Key Filter are all capable sound sources, but in most patches I employ these as modulators. I use Intellijel Hub mults and Koma attenuator cables to save HPs.
In this rig's current state the A-135-1 VC Mixer has become a go-to module. I run the XY and Z outs of the E350 and the Main and PW outs of the Orgone into it and I get some unique multifaceted sounds, especially when all four VCAs are gently modulated. Dr. Octature will give me even more power with phase modulation of all four VCAs, in addition to the analog sine wave VCO/VCF.