I just got the amp, and I was wondering how I can make it brighter. I am playing it through a Germino with Blues and G12H30 open back. With humbucker equipped guitars (Johnny A/ Firebird with WCR Cross Roads) it is very "middy" and the treble is almost full up. I was wondering if I changed some of the preamp tubes or Power tubes if that would help? What does V1, V2, V3, V4 control? I would like more chime. Would the conversion to the RSA31 help; I have a DC30 and would like to make a little closer than that.