This is a chiptune tracker for android that's trying to sound a lot like the MOS Technology SID. The synth code is based on TinySID by Tammo Hinrichs (kb). Some details of the SID chip aren't emulated correctly but it's close enough, I think. Also, I added a fourth voice (but you don't have to use it if you don't want to, of course). The tracker is highly inspired by lft's Blackbird.
Check it out on Google Play Store!
Listen to the demo songs on SoundCloud!