Like many preamps, CA-UGLY has a two infinitely variable gain potentiometers, one for each channel. On my CA-UGLYs, each pot adjusts gain from mute (fully counter clockwise) to full gain +20dB (fully clockwise).
I use the two CA-UGLY(s) most often with four identical mics, almost always use the same mics into the same channels, and have adjusted the gain pots on them to provide output levels as closely matched as possible.. which is to say just pretty close as measured on the input meters of my recorders.
I'd like to accurately measure how much gain I am applying to each of these four channels. What's the best way to do that?
Gear:
I have a Behringer cable tester with a signal generator in it; I can generate test signals on the computer and play them directly, from a recorder or CD; I can record a pass-through test signal to one of my recorders and transfer the files to the computer to compare RMS levels; and I have a digital Voltmeter that I can use to measure output voltage directly.
What do you all suggest?