I have a question regarding the noise I hear with my AD30VT.

When I have the setting on manual and then make a single strum of the strings, it begins to break up as the sound from the strum goes on. I have no effects set and I've made various adjustments to gain, treble, middle, bass, and volume, but the break up won't go away. However, if I go to preset I don't get that when set at boutique CL through UK 70's. The rest of the settings will begin to do that.

So, what would cause the break-up when I am in the manual position?

I do not get the same with the Valve Jr.