MIDITina is an English Concertina CoreMIDI control surface.

MIDITina doesn't produce any sound on its own, it is for playing hardware or software VST-style MIDI synthesizers via CoreMIDI hardware interfaces connected to the dock connector or virtual MIDI instruments running on your device such as IK Multimedia SampleTank or Sonosaurus ThumbJam.

Please visit the app support website to see some amazing live demo videos and for the settings you will need to enable in the synth app you are using to have it work with the control surface.

It supports several button-to-MIDI note map layouts, including English Concertina, as well as standard chromatic scales.

For use as a simple 27-button MIDI trigger, two layouts are provided that simply label the buttons with numbers.

The entire range may be transposed up or down up to two octaves in semitone increments using the "Transpose (semitones)" slider on the settings page.

While playing, you may also optionally send real-time volume, expression, modulation, or wind controller MIDI messages by tilting the iPhone/iPod to the right or left.

Here's the settings changes required for two popular synth apps:

IK Multimedia SampleTank:

- In Settings (touch the gear icon), enable "Background Audio"

Sonosaurus ThumbJam:

- In "Prefs", under "MIDI Control", in "MIDI General Options" enable "Use CoreMIDI" and "Active in Background"

Other CoreMIDI compatible synth apps will have similar settings.