When getting Super 6 as my first hardware synth I also had in mind a semi-modular synth. Instead of going that route I´m experimenting with building a eurorack where Super 6 provide the oscillators. I was surprised just how beefy the sound could be shaped through an external vcf and vca. In the test I´m routing the S6 oscillators thru Vult Vorg (MS-20 filter clone) and AJH Discrete Cascaded VCA + Contour Generators (Moog Model D clone). The audio is then routed to the computer into VCV Rack for some reverb and delay.
This demo is kinda crude and simple but demonstrates how beefy the Super 6 oscillators can sound when shaped externally. The Super 6 is in mono mode and set to 3 saw oscillators. The short initial clip is the oscillators directly into the computer while the rest is thru Eurorack.