Thanks Phil_m. I'm running in flat mode with voicing as FRFR. I've now tweaked the levels in my patches so they're just under the max with the LED just under or occasionally flashing red on lead patches and I'm almost there. It's probably just loud enough for rehearsal but not used it live yet as everything gets louder live, especially the drummer, and I'm afraid I can't go any higher. I found the feedback was being generated by specific patches but these were expensive patches purchased from GD so I would have thought this would not happen. I must say this has disappointed me as I expected more after spending almost £2.5k. I have extended warranty I may return the lot