Hi,
Just wanted to post this in case anyone else stumbles across the issue.
I had an issue with really bad digital clipping in low volume mode. I removed the HD500 from the chain and went straight into the top of the amp, still no luck. The normal volume mode seemed OK, but low not. Anyhow, I read in this forum that the low volume mode is modeled and not done via the same signal path so I thought to upgrade the firmware. I was already on 2.0 (latest), but I went for the reflash anyway. When the amp came back up again, everything was back to normal, so either the program in the flash or some settings had been corrupted.
Cheers,
Jim