Wah Pedal Position slider (Controls view): Choose View > Controls to access the Wah Pedal Position slider. The value of this parameter represents the current pedal position, ensuring that it is saved with the setting. Choose the Learn menu item to automatically assign the parameter to the first appropriate incoming MIDI data message, then move the controller on your MIDI keyboard. Learn mode has a 20 second time-out feature If Vintage Clav does not receive a MIDI message within 20 seconds, the parameter reverts to its original MIDI controller assignment.
Download the guides:
Logic Pro User Guide: PDF
Logic Pro Effects: PDF