That's how our preamps are set up. The individual Gain Trim controls are used to set balance and overall gain. The Master control then makes adjusting the volume very easy.
The hearing in my right ear is ever so slightly better than my left ear and I usually notice that the sound stage favors the right side. Can that be due to slightly better hearing in my right ear or might it be room acoustics? Would a preamp with trim controls and a master volume be useful in this situation? It seems like it would.