Dear Friends Please forgive me, i'm new to this forum, sol maybe this thread discussed before. I'm experimenting with a diy mic preamp, based on AMEK 9098 mic pre schematic. I'd like to know, is there a good/reasonable method to set the input variable capacitor and the two trimpots(LOW/HIGH CMRR TRIM)? On the attached schematic the parts: VC1,VR14,VR15. http://audio.etata.hu/files/system_9098_micpre.jpg I heard, that the adjusment must be done at mid gain setting (30-36dB) and the trimpots are for mid frequency, and the VC1 is for high freq. I imagine to short the two inputs, fed with some sinusoidal sign, and with an oscilloscope, monitor the outputs to have a minimal or zero sign between the high and low differential outputs (XLR pins: 2 and 3) Is that correct? Thank You in advance!