“Little MIDI Machine is an analog-style MIDI step sequencer app for IOS (ipad & iphone). With version 3 you can also use Little MIDI to sequence iOS synth apps that support CoreMIDI and background audio!
Little MIDI Machine gives you the step sequencing power of a hardware analog sequencer on your iPad, iPhone or iPod Touch! Program two independent sequencers that send note and velocity MIDI data out on two MIDI channels to control your hardware synthesizers. LittleMM includes many of your favorite hardware sequencer features such as mute and un-mute notes, skip steps, reverse the sequencer, adjustable clock speed, etc. If you do not have a compatible synth app, a CoreMIDI hardware setup, or a MIDI Mobilizer setup, LittleMidi can generate very basic melodic sounds in place of sending MIDI. This will let you play around with the app and try it out, but it is not a feature that will be developed further and is not the primary purpose of the app. LittleMM is intended to be a MIDI sequencer driving other apps or external MIDI hardware.”
Source : syntheticbits.com