Elby Designs - Pixie
The Pixie is a clone of the WASP that keeps the salient features of the WASP but replaces the keyboard circuitry with a MIDI interface to provide a more flexible product, giving the user access to a wide range of MIDI controllers including keyboards, laptop/PCs and iPad's. To help improve the stability of the design, the two 555-based VCOs and associated decoding circuitry have been replaced with a dual-digital oscillator built on the Mitsubishi M16C. The Pixie expands the original WASP by adding the following extra functions:-
Additional waveshapes on both DCO's (Triangle, Sine and Modulated Square)
2nd WASP Filter
4-channel pre-Output Mixer .