Yet another poor owner. I am sorry to tell you that this is a common problem. If you want to do anything about it - forget it because Roland had mine back - admitting to me there was a problem with their 18bit DACS, but said that there was nothing they could do about it. I argued with them and argued and got nowhere. (The only thing they said was that e-mails had been sent to Japan (ABOUT 8 MONTHS AGO!) Sorry to be the bearer of bad news but someone has to stand up and say the truth against this huge dishonest and unhelpful company.....