Yes, my devices go into the receiver, the receiver out line goes into the PC line-in jack. I can adjust the volume on the receiver, but it doesn't affect the volume of the source that Audacity is detecting. That stays the same, unless I adjust some properties in the software I guess. But it seems I have everything turned up to max, and the tape deck sound is still too low. With the phono, I have to turn all software down to the minimum levels, and it's still too high.
I had the exact same equipment set up a few years ago with the phono, and I don't remember having this problem. Maybe it's the new beta version of Audacity?