ATTENTION: I haven't wanted to work on this in a long time, and I don't think that will change any time soon. Maybe I will open-source it some day. The app seems to work well, but it may not have all the features you're looking for. You have been warned!
Syntheogen™ is a music sequencer and synthesizer with a fresh look and a design that specifically targets touchscreens and small displays. It produces techno, hip hop, synthpop, and many other electronic sounds.
+ Produce your own sounds with sampling, subtractive synthesis, or both in the same patch. Trim and loop WAVE files in the app to use your own samples.
+ Add as many tracks and apply as many effects as your device can handle. Effects include clipping, reduction, flanger, chorus, filter, comb filter, tremolo, delay, and reverb.
+ Edit multiple patterns from one screen with unique LOOP STEPS view. Zoom in with pinch gestures to edit small steps; zoom out to see entire composition. Tap headings to work within full scale range, even when editing percussion patterns.
+ Divide measures into fifths, sevenths, or almost any number with custom STEP GUIDES. Make patterns anywhere from four to 64 beats long, and combine different lengths in the same loop to produce polyrhythms.
+ Use STEP TIES for precise control over pitch bends and note dynamics. Bend entire chords, or produce 'pedal steel' sounds by bending one note while others are held.
+ Transpose patterns to different scales or modes with a few button presses.
+ Export finished loops and songs to WAVE files for external playback
+ Get control-by-control help without leaving the app by tapping '?' buttons on almost any dialog. Learn more from detailed online user guide.
+ Minimal device permissions required.
For best performance, it is recommended that you run Syntheogen on a quad-core device or better. Older dual-core devices are likely to produce dropouts when complex mixes are played.
Samsung S-Pen input may not work on all devices. There are reports that it does work on the Galaxy Note II and the Galaxy Note 10.1, but not on the Galaxy Note 8.0. Ordinary touch input continues to function as expected. For now, the S-Pen is not officially supported.
TRY AND BUY
This is the 'full' version of Syntheogen. Before buying the app, try the free demo at https://play.google.com/store/apps/details?id=com.syntheogen.SyntheogenDemo