Some of the gear developed and used in performance and recording over the years...
1987—early ink-on-paper diagram outlining the layout of the original Feedback Machine.
1987-1993—The "Feedback Workstation". This is how carried away you can get, and it developed over years. Based on four digital delays. Included are custom mixer with feedback matrix, a smaller submixer, two DIY ring modulators, a nutty timeclock generator/enveloper/delay modulator, etc.
1989—The "carry on" Feedback Machine, on a stand for performance. A real rat's nest inside, and a touchy unit, but it rocked in its way. Mounted on top is a device called The Squealer.
2000s—Advances in processor design allow for more sound-bending in smaller and cheaper devices than ever, and there is less and less need to build extensive mixing arrangements. The feedback mixer here is very minimal and easy to construct.
2014—The Noise Matrix, a mass of DIY circuits and ripped-apart effects pedals, all matrix-mixed between each other for some pretty complex tonalities.
2014—The Mini-Modular. Overall I'm not a huge synth fan, but this collection of Eurorack modules produces an infinite array of waveforms without any controlling input, envelope generators, VCFs or VCAs. Just waves!