Got one of these to serve as a line mixer for my rack setup. Had it for awhile, but have always struggled with it. Regardless of how it's set, I always think that I'm losing some fidelity running my gear through it - which is surprising since I know Bob Bradshaw used these for years in some pretty high level rigs (e.g. EVH). Any thoughts or tips on using one (or a couple of these) in a rig? Thanks.