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/details?id=nightradio.pixitracker1bitdemo

[ Key features ]
• retro-style 1-bit sampler;
• pattern-based sequencer (tracker) with unlimited number of patterns;
• several packs with unique sounds;
• sound recorder (from microphone or line-in);
• WAV export/import;
• PixiTracker is also available for iOS, Windows, OSX and Linux;
• PixiTracker player is open source, so you can freely use it in your own Pixilang applications;
• true warm pixel interface!

[ Known solutions for some problems ]
http://warmplace.ru/android