MIDITinaXL is 48-button English Concertina CoreMIDI control surface for the iPad.The button layout is identical to the real instrument, and the built-in note guide makes it easy to learn to play!MIDITinaXL 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. 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. To play, simply touch the buttons. Buttons light up when playing.Multiple buttons may be touched at the same time to play chords.You may slide between the buttons.Touch the diamond area at the bottom center of the screen to add vibrato effects. Touch and release in the upper half for a high vibrato, lower half for a low vibrato. The farther from the center vertically, the deeper the vibrato depth. Touch the '?' icon to show the note names for each button.Touch the MIDI connector icon to show the MIDI controls. You may select the volume, MIDI channel, attack velocity, and semitone transposition (+/- 12).All MIDI settings are saved when MIDITinaXL quits and restored the next time it is run.Touch the '!' icon at the upper left to quiet any "stuck" notes if they occur.Rotate the iPad to portrait orientation to display the instruction screen. Rotate back to landscape to continue playing.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.