[mikelevins]

The TR-808 and TB-303 sound pretty good to me. I was in an electronic rock/pop/avant garde trio throughout the 80s and we used those two devices (and a Sequential Circuits Pro One) a lot. I still have pattern notes I could use to reproduce our old patterns with these emulations. They sound pretty close to me, though you have to allow for the unreliability of memory.

[tomc1985]

I always look for how the filters sounds with Res set really high. Good analog filters have a sort of fuzzy quality to them, which I suspect (not an EE here, just guessing) is extra harmonics from how that circuit behaves under those conditions. A lot of software emulations just sound thin, this included.

I'm not an authority on the 303, though. I just like to play around with analog gear sometimes.