NEVER MIND : found the video "(what to do if your recordings are too quiet)" and it answered my question! I did NOT understand exactly what Normalization does, very powerful and handy!
My set-up seems to have resulted in most (~90%) of my records being too quiet after recording. It becomes an issue when I copy those tracks to a USB drive along with CD rips - which are mostly MUCH louder, and play in my car.
I just figured out that I can use the Pre-Amp Gain in the Graphic Equalizer to adjust for this,

so for future digitizing that's fine- question is what to do about the 3 dozen or so recordings I already have. Some of these were NOT too quiet, others were VERY quiet - so I need a way to determine an "appropriate" boost level setting on the Pre-Amp. During initial recording, I can keep an eye on the level meter and get a reasonable idea of what gain, but how about with previously recorded sides? Any way to guestimate an appropriate level?