thanks, that looks interesting. i like the x0xb0x project a lot. still they put a lot of afford in remaking a tb303 not keeping the design simple. it's not that i'm lazy, i just want to start at a point where i know each of the components and know what they do.
do you have any experience in using a 555 circuit as a VCO? i think the circuit would be super easy. i'm a little unsure about the bandwidth and accuracy though. i think i will give it a try as soon as i find the time. unfortunately not in the next couple of days.
best, kuk