An update on an old thread............ My Kemper went bad a few times again, each time I was able to restore it, and get it sounding good again. Until the last time, whereby it went bad, and stayed bad. I had been in contact with Kemper for a week or two prior, and was able, finally, to send them a sound-clip of the problem. They suggested a Return to Base, so it's on it's way now. Andertons were excellent, and arranged for the collection of it yesterday. Just have to be patient now, and hope it's fixed upon it's return. With it having been an intermittent problem, there is always the worry that it will behave itself on the day. Here's hoping that it stays bad
I sincerely hope you'll be sorted this time.