Real Band rendered file volume is too low.
My issue may be a little different because the issue occurs when files are rendered. The volume can be raised as you say, but when compared to other sound files it is much lower.

I rendered two real tracks: bass, volume at "90" and drums at "117" to stereo in Real Band for 3 separate songs. I then converted to mp3 & sent to a sound mix person as backup tracks for a show.

All 3 were significantly lower volume, resulting in playback out of balance with live sound in the mix. We had to boost significantly.

What could be done to resolve? I want to have a result where more volume is on the rendered tracks. Would setting RB to lower volume make the mix render louder? Is there another setting I can change?