what is "unity gain" ?

Some reading:

http://www.rane.com/note124.html

Dave

hey Mike,

I went to the BAT website http://www.balanced.com. Then click on "resources" then click on "manuals". On that long list, you'll see a manual for the VK-30.
It's in PDF format.
At the bottom on Page 13 & continuing on Page 14 you'll see a topic of "FIXED gain mode".
There you'll find an explanation of "unity gain" mode.

Basically, it puts the preamp in gain=1 mode so that the volume knob has no effect.

Hope that this helps. FWIW.

I think it's when the volume control on your preamp is neither boosting or attenuating the signal.