Molten Drum Machine is a free drum sequencer for iPad. It’s functionality is basic, and it’s very simple, but it’s fun for programming beats.
Our favorite feature is the MIDI export. This is useful because it lets you create a sequence in the app, then take it to your professional software such as Logic, Digital Performer or whatever your DAW of choice is.
That means that Molten can be used as a musical sketch pad, then any particularly awesome patterns can be spiffied up with more professional sounds and effects.
Oh, and the app is free.