From the Play store:
Simple and fun sample based tracker with true 1-bit sound.
PixiTracker 1BIT is a simple and fun tool to quickly create musical sketches, chip tunes and experiments with TRUE 1-BIT SOUND like on old computers.
No musical knowledge required!
You can try the demo version for free: https://play.google.com/store/apps/deta er1bitdemo
[ Key features ]
• 1-bit sampler;
• pattern based sequencer (tracker);
• unlimited number of patterns;
• several packs with unique sounds;
• mic/line-in sound recording;
• export to WAV;
• true warm pixel interface!
I just downloaded it on my phone and it's very interesting. I can't wait to see what I can do with it.