Airstep Lite
Wireless footswitch designed to control a variety of music apps, hardware devices, and software via Bluetooth and MIDI. It features five footswitches and supports multiple profiles for easy switching between control setups.
around $150
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Once set up, this is a superb controller giving long press, short press, release and double tap options for each of the five buttons. The software takes some getting used to, but works a treat with the iPad once you have it set up.