OK, so the mesa 400+ has an xlr DI out. The problem is, the stupid engineers who designed this amp hooked it up to the master volume knob. this means 2 things: 1. if you are using it at a gig, every time you adjust your master, you also adjust the volume to the board. bad 2. you can't record with the DI without having your master volume turned up. the slave also sort of works for a DI, but at least on my amp, you can't run it with the master at 0. (it sounds all distorted for some reason...does anyone else have this problem?). also, i'd prefer to use the xlr. (speaking of which, does anyone know any specific technical differences between the slave out & DI out?) anyways, is there some sort of mod to disconnect the master volume from the DI?