Man, I never thought Id be a rack user, but for now that looks like the direction that Im headed. I just have always found myself wanting more when I use a head for my gigs they just never seem quite flexible enough to cover all the ground that I want. Ive tried using pedals in conjunction with some of my heads in order to obtain more versatility but even the best pedals leave me feeling like my tone is compromised especially when I compare my tone with and then without the pedals/router/switcher in the circuit. Even when I had my Switchblade Continuous Full Matrix router, which is a KILLER piece of gear, I lost some tone and introduced a bit of noise with it. At one point, I even tried using 2 heads in my rig what a PITA that turned out to be sure, I got more versatility, but not worth all the headaches and additional effort required to lug them around and get them to work together, plus the 2 amp setup was a bit noisy and real bee-atch to dial in and tweak. Enter the midi-controlled, rack mounted pre-amps: Soldano X99 and ENGL E580. These bad-boys have the versatility that Ive been hankering for, but do they have the tone? I think so, but you tell me listen to the clip below and issue some feedback. http://boomp3.com/m/5a673dd94df2/girls-got-rhythm Clip details and a disclaimer: the clip was made with a cheap SR-16 drum machine there is no bass guitar in the mix and Im not a very good player on top of all that, I absolutely SUCK at making clips. It seems that some guys know how to lay down tracks and mix them well, I dont all that is to say that these amps sound WAY better live and in person vs. this hokey little clip still, the clip does show somewhat how these amps can (IMO) pull off the low-gain crunch stuff they arent just high-gainers like Id always thought theyre actually much more versatile.