Out of desperation, I tried inserting the mono (TS) cable into each of the two pedals but inserted to the “first click” only, not fully inserted.
It now works with the caveat that the pedals only go up to 75% and not 100%, but I assume the calibration in fact adjusts for that.
This is a studio setup so the fact that the cables are not fully inserted is probably ok but I wonder if it means that I need a special wiring on the Y-cable, as I used a straight insert cable. It seems like the common ground shared by the two pedals creates a problem for these pedals, which are Boss FV500-L.
So any suggestion about rewiring of the cables would be welcome so I can fully insert them.
Regards
