Last night I sent two prototype versions of the sub oscillator for PCB production. The "normal" single sub oscillator with the cool inverted saw thing, as well as a stackable quad sub oscillator that can be used for my 7-saw/polyphonic modular project. The quad version will need a separate controller card as well, to be able to select the type of wave and polarity etc for eight sub oscillators at the time.
If successful, the single sub oscillator is destined to be the first official product from Xonik Devices, my new brand. All future projects will be released under this name.