I have a Fender Custom '64 Vibroverb with the 15" speaker and the stock Diaz mod. I want a midrange control on this amp, as I can't get enough midrange w/the stock bass and treble controls. Please don't tell me to buy an eq pedal. I want a midrange control installed. Who is qualified on the northwest coast to do this with a proven track record, and under a month turn around times? I've got gigs all through the spring and summer, and I don't want to be without this amp for 2 to 3 months. If anyone has this info, and can recommend someone really good, I'd be very appreciative. Thank you, Jon in Idaho.