You might think that this was a drum machine, but it isn’t really. This app describes itself as:
The first and only application able to control a real drum machine : microDRUM ! Compatible with Line 6 MIDI Mobilizer.
So in order to use it you need a microDRUM. So what’s one of those then? Well, here’s what the microDRUM site has to say:
MicroDRUM is the most economical and simple way to build MIDI drum trigger. It’s based on Arduino and can be used with a huge variety of e-pads / e-cymbals, up to 48 inputs! The output can be sent to a PC and converted to drum sounds through VST like BFD, Addictive Drums and Superior Drummer, etc. … The accompanying software allows features not found in any similar solution: a direct interface with VST (without USB-MIDI cable), record, playback of tablature to practice on, etc. … This is a Open Hardware product made in Italy!
So the two together make for an interesting mix all in all.