This second version of the iOS mini studio is a big step up from its predecessor, offering a sequencer, two types of instrument (a drum machine and a sample-based synth with a large and varied preset bank) and a mixer.
Sounds can be recorded in from the mic or pulled from your iTunes library; swing can be added; the mixer looks great; tracks/MIDI can be uploaded direct to SoundCloud or exported; and you can swap audio pasteboard clips to and from iOS. And that's just for starters.
BeatMaker 2 isn't perfect, but you can certainly have plenty of fun with it and create some very pro-sounding results. 4 Stars
Full review: Intua BeatMaker 2 (review is of a previous version)
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