Looks like this is on sale again for a whopping 100% off! Seems pretty nifty.
G-Stomper Studio is a Music Production Tool, highly optimized for doing Electronic Live Performances in Studio Quality. It's a feature packed, Step Sequencer based Drum Machine/Groovebox, a Sampler, a Virtual Analog Performance Synthesizer (VA-Beast), a polyphonic + a monophonic Step Sequencer for melodies, a Track Grid Sequencer for Beats, a Piano Keyboard, 24 Drum Pads, an Effect Rack, a Master Section, a Line Mixer and a Live Pattern/Song Arranger. Wherever you are, take your mobile device and start straight away creating your own music.