In GP (Sonny landreth issue) they show a mod where you take a sheilded cable and solder an RCA end on and run it from the reverb pan out to the input of the normal channel. This gives you tone control over the post reverb signal. At first glance, it seems obvious and totally reversible. Does this work? I thought that the reverb and normal channels were out of phase. Does the phase get inverted post reverb tank?