My Steck PEDA upright seemed to be working quite well when switched to Duo-Art mode. However, it has now suddenly started playing Duo-Art rolls at full volume. Physically, everything on the expression box (regulators / accordions / linkages) seems to be working normally with Duo-Art rolls and DA test roll, but everything is played at the same 'full on' volume. All the (new silicone) pipework seems to be intact, so where should I start looking for the fault ?
Thank you for any help.