So its not clear where you are going with this, but clearly it fails to address my prior post if that was your intention.
I’ve addressed everything that need to Ralph. Once again simply.
"Any! active stage/s introduces noise hum and distortions, increase their gain and you increase those as well."
So it’s best to use as "most" as you can from the "passive" Master volume (which has virtually no noise hum or distortions), and use as little as possible "gain" from the active stage. Couldn’t be simpler.
Nelson Pass:
" A “passive preamp” - just an input selector and a volume control.
What could be better? Hardly any noise or distortion added by these simple passive parts. No feedback, no worrying about what type of capacitors – just musical perfection."
Cheers George