REW sweep on mid/hi, limit Hz?

Joined 2018
Paid Member
The voltage setting in my REW seems locked at 1.00v. Through my laptop headphone out Windows volume set to 100pc and it all goes through my pre/power amp and I have the volume about 65pc so REW tells me the level is 'OK'. I'm never quite sure what I should be doing here apart from turning my preamp volume until the level test gives me the OK.!