My current amp seems to not amplify the D and G strings as well as the B,E and A. The B,E and A come through very robustly while the D and G sound a bit muted. I did not have that problem with my previous amp as all strings came through about the same. The Strings are relatively new so I do not think it is the strings.Can this be caused by something with the amp???? What other possiblities could be causing this??? Can I corect it with an EQ pedal? Any Ideas?