by David
(New Carlisle, OH)
My amp makes this buzzing sound when the knob for sweep echo/reverb/delay is turned on.
ANSWER
Hi, David--
If you have ruled out all of the obvious causes--bad cable, etc.--then the best thing to do is take it to a qualified repair person.
You can find one in your area by visiting:
http://line6.com/service_centers/
While you're on our site, why not check out our
Absolutely Free Guitar Lessons! You will find tons of free lessons and other valuable resources.
Best Wishes,
Lynne