SidTracker64 is a chip tune tool for the iPad that emulates the SID from the Commodore 64. The features are: Midi keyboard. Export your music to .sid or .prg files (Dropbox / e-mail). Fully emulated SID 8580 R5 chip. 3 Voices, 8 waveforms, 3 volume envelopes, 32 instruments and vibrato controls. Wavetable & Filter editing and much more.