As an example: I go into map mode, choose "reverb device on", and press the button under the first slider (F1). The midi map list will list the new mapping as "Pitchbend - reverb device on." Once I exit the mapping mode, pressing the button will do nothing however moving the pitch bend wheel will cause the reverb device to switch on.
Am I missing something here? Anyone else seen anything like this happening or know what I'm doing wrong?