I'm putting my rack together, and I started with just the Gtr-Tri-2:90-2 4x12 Marshall cabs. I've had the Tri for a long time, and the noise wasn't different from the way it has been in the past. My Dbx has always controlled it through the loop, but I wanted something I could set and never have to touch again....even on the clean sounds. This way I wouldn't be taking up any loops and I could free up the other Dbx channel. I added in the Isp next, so now the chain went Gtr-Isp Ch.1-Tri In-Tri Out-Isp Ch.2-Ycable to 2:90-Cabs. Right away when I turned on the Isp the noise floor went up and the unit made things even louder. I could see this being a problem, but the Isp is suppose to take care of this anyways. Listen to there demos on their website. Mine doesn't even come close to that transparency when you stop playing. The noise gate is very much heard when the playing stops....you can hear it sucking out the noise before its dead quiet again. I found out about a mod you can do to cure this on another forum awhile back and sent it in. The changeability is very little. I'm going to call Isp on Monday and see what they have to say.