I'm running it from 9V battery.
All cables are shielded, and the circuit is in a metal box, also connected to the shield.
I'm not using any extra gain on computer side, I can only lower it from 0dB. (it doesn't help)
Mine has 1 potentiometer, I've tried fine tuning with it, but didn't really help :( ( Building a Microphone Amplifier - Watch Timing System I've made this amp)
(I'm not a pro in, so I don't know how to tweak it, I could just make the soldering, and PCB...)
However it is sure, that TG has a really good noise filtering algorithm.