Hi Nicola

If I understand you, you want a relay bypass. So, after having carefully studied the User Manual

1) set the [BYPASS][BYP TYP] to RLY.

2) Assuming you want to use MIDI Program Change to select the bypass:

edit the [MIDI][RCV MAP] to give you either OFF, ACT,TOG or BYP, depending on how you want to control it. These values are:

               OFF   Unassigned

                BYP    BYPass the unit

                ACT    Make the unit Active, i.e. not bypassed.

TOG   Toggle the between bypass and active.