Papernoise Concertodrone MK3 (circuit-bent Casio SK-1)

demo video of my circuit-bent SK-1. UPDATE: Detailed build docs are now available here: http://www.papernoise.net/concertodrone/ ATTENTION: I really appreciate all the great feedback and the kind words, but if you're going to comment "How much do you take to make me one of these?" or "can you build me an SK-1 like this?" The answer is, and will always be: NO WAY! I have my reasons, believe me. I'm not going to build one of these ever again. So please don't ask. more INFO: 0:30 mutlimode VCF, the concertodrone features a LP/HP synthacon-style filter with basic voltage control. The filter is pretty overdriven and has a nice nasty resonance 1:00 555-timer-based LFO. I've added a simple oscillator based around a 555-timer-IC. This one can be used as a modulator with the VCF or patched into any other jack for some unpredictable effects 2:00 lo-fi echo effect. I've added a PT2399-based echo/delay effect. I don't use it very often, because it's a bit too lo-fi and I should have extended