If you connect more than one iControl to your computer, none of the control surfaces will work. Please note that GarageBand only supports one iControl device at a time. If you connect more than one, many buttons and controls on the first device won't work, and all additional iControls will be completely non-functional.
GarageBand: Multiple iControls may not work
If you're using an M-Audio iControl with GarageBand, the iControl may not work if you connect more than one iControl to the same computer.
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