I am working on an amp with no NFB around the power amp. Since there's no NFB, the Long-Tailed-Pair has a grid tied to ground (thru a capacitor). Would it be a bad idea to use this normally-grounded grid as a return from a parallel FX loop? I see that Matchless uses the phase inverter as the reverb mixer. I'm not too concerned about signal levels. My delay pedal can return line level. I'm more concerned about the phase. I realize that the wet and dry signals will be 180 degrees out-of-phase, but with time based effects, I can't get signal cancellation, right? The 180 degrees would be like adding or subtracting a few mS to my delay time.