Ah, so the amp does have LED indicators. If only there was a way of connecting to those the sync problem would be solved!.....
You mention 'if the footswitch does not have LED's', suggesting there are some commercial footswitches which do have LEDs. If that's the case I wonder how they overcome the sync problem?
You mention 'if the footswitch does not have LED's', suggesting there are some commercial footswitches which do have LEDs. If that's the case I wonder how they overcome the sync problem?