Monitoring Issue

I am working Audacity 2.3.3 on Mac Sierra. I have a monitoring/playback problem. When I monitor or listen to what I’m recording, it is rather faint. When the recorded signal is played back, it is approximately 13db louder. I’m using Avid Fast Track Duo USB interface. Phones are ALL THE WAY loud. I have to turn the music I’m tracking to down some 18-22db just to hear my voice when recording vocal. Signal input level is as loud as possible without distortion. Can’t seem to solve this issue, since Audacity’s built-in input level renders itself dysfunctional in presence of interface. Does this sound familiar to anyone? Thanks.