nekobee is a DSSI soft synth plugin that emulates the sound of the TB-303 Bassline. It is not an exact copy; rather than make it "just like the real thing", the design concentrates on modelling the circuitry and was adjusted by comparing the sounds achievable with it to those heard on classic acid house tracks. It includes a switchable square/saw wave VCO, 24dB/octave VCF, an adjustable decay time for the VCF, a fixed decay time for the VCA, and an interesting bit of circuitry around the "Accent" control. WWW: https://github.com/gordonjcp/nekobee