Mapping an Expression pedal to control plug-in parameters in Reaper


To Enable a MIDI input device:


In Reaper Preferences->MIDI Devices, enable the MIDI Device for 'Control Input'.  In the MIDI Devices preferences view, find the MIDI input device that you wish to enable, click and select 'Enable input for control messages'.

 

To map an expression pedal to Wah Thing:

  1. On the S-Gear track, click the 'Track Envelopes' button 
  2. Find 'Pedal Wah Manual' in the list, click the LEARN button
  3. Move your expression pedal to capture the incoming MIDI CC number, click OK on the dialog box.  The pedal should now be mapped to S-Gear Wah Thing.