I was playing through my ABM EVO II today with the sub-harmonic generator on, and I noticed a pronounced dead spot in the signal when I play on the fifth fret of my G string. It is not there when I fret above or below this position or when the function is turned off, and it sounds almost like there is a mute on the string. I emailed Ashdown today and I am waiting for a reply. Have any of you ABM users ever had a problem like this? My amp is still under warranty, so I should be able to get it fixed.. Where have you guys had the best luck with warranty service? I don't have anyone local that I know of. Any suggestions would be much appreciated.