The oscillator bit is, but I don't appear to have uploaded the one with the filter which I will need to find.

https://github.com/ErroneousBosh/slttblep

The filter is just an SVF with, with a precomputed expo scale "bent over" at the top to correct for quantisation. From that the two SVF coefficients ω/Q and ω*Q are calculated every time there's a control update and of course because you can't divide on an Arduino it uses a lookup table of reciprocals just as for the blep. I could probably use a "wider" table of 16-bit values for better precision.