I want to control start/stop playback of a pre-recorded loop saved in a session via a Bluetooth foot pedal eg Airturn Pedpro.
I run Loopy HD on an iPad 3.
Is this possible?
It certainly is, @Tongo. Right now the easiest would be probably to use the Pedpro in keyboard command mode, but you can also use it in MIDI mode if you connect it using any third-party app that gives access to the Bluetooth MIDI connections screen (like Audiobus). Loopy will add that soon, too.