CAUSTIC Music Rack allows you to create electronic music on the go.

The package comes with 8 machines:

• 1x Virtual analog subsynth
• 2x PCM synths (23 demo samples included)
• 2x 303-like BassLine synths
• 1x Sampling drum machine (9 demo kits included)
• 1x Mixer desk with Delay/Reverb and 6 insert effects
• 1x Song sequencer

This video provides a good overview of CAUSTIC's features:

All files are stored on the SDCard - you can supply their own WAV files for use in the PCMSynths.

New in v2.1.2

• Bugfix for MIDI controllers not working on certain devices.
• Saving presets in SubSynth now offers the current name as default.

New in v2.0.2

• This bugfix release contains:
• Fix for synth patterns dropping out in song mode.
• Fix for a crash bug when using long sample names in PCMSynth.
• Fix for BeatBox not taking samplerate into account on playback.
• Fix for reverb/delay knobs unable to clear automation.
• Fixes for a few edge-case crash bugs with SoundFont import in PCMSynth.
• Fix for Caustic directories being non-deleteable on a few devices.
• Fix for instrument tuning errors on SoundFont instruments in PCMSynth.

New in v1.2.0

• Added Ogg vorbis export format
• Added MIDI export format
• optimized all machines and effects for reduced CPU load
• Added three new subsynth inverted envelope modes

New in v1.1.2

• Fixed an audio bug when loading empty wavetables in SubSynth
• Sequencer tweak for laying down consecutive notes when in "draw" mode.

New in v1.0.4

• Fixed a startup crash bug on certain Gingerbread devices (HUGE thanks to Niels Bonnevie for helping debug this one)
• Fixed a pattern placement bug that stopped you from adding new patterns once you had hit Cancel in the pattern selector popup.