I've had an ongoing love/hate affair with my Dr Z Airbrake for the last 10 years. I originally bought it to tame my non-Master Volume Z amps, but never quite bonded with it in that specific application, so it has just sat in the closet for a loooong time. I almost sold it a year ago, but my inner packrat won out (thankfully). Last night on a lark, I decided to try it with my JTM-45 homebuild and WHOA NELLIE!!! That amp begs to be driven hard (just on the verge of breakup), as it inhales pedals at that volume; emits molten liquid sustain, and is so harmonically rich. However, it's just so damn loud, that it's a real challenge to dial it in for home use or in small venues. Not anymore... Once I had the Airbrake in the loop, I cranked the JTM to about 6-7 on the volume knob and knocked a couple clicks off the attenuator, and I was getting all the fat, low-mid girth and gnarly high volume tones I love at much more ear friendly levels. I know the Airbrake is not the most highly regarded attenuator out there, but it kills with my JTM-45. It looks like I'm finally gonna get some use out of this thing.