Push 2 Pedal Expression was created by Ableton developer Ralf Suckow. It's a Max for Live MIDI effect allows you to calibrate one or two passive analog expression pedals plugged into Push 2, and use various MIDI control changes to control parameters in your Live Set.
Included in the download is the Max for Live device (.amxd) as well as a instructional PDF. More information and video tutorial.
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Max for Live MIDI Effect (.amxd) + instructional PDF in a zip-file