Drum synthesizer - construction 1

I'm in the middle of the building phase. The two drum voices (with the Wasp filters) are working properly! :)

I've made a temporary, cardboard faceplate, because I need to finalize the graphics. I need to make an extra PCB with the VCF LFOs (4069 LFO), some preamp for external input signals, a 555 negative supply circuit, and maybe a headphone preamp too. I also need to make some experiments with cross-VCO modulation between the two DS8s. If it sounds good, I will put 2 pots on the front panel with this functionality. I will make experiments with Wasp out -> DS8 VCA in feedback loop. I like distortion... :)