Low Volume on CDs - Roland 2400 CD
There are a couple of places to look; I'll assume you have a decent input level near -12db average without peaking. First, ensure during playback upper right meter labled MST is near peak without going over, if you have room push the master level above 0db to +1 thru +6db and recheck for peaks above 0db. (You never want digital recordings to hit above peaks, you lose quality or resolution of the sound)
As you find the sweet spot, master rec to 23/24-16 using the elevated level on the master fader. The manual suggest editing and mastering with the master fader at 0db however if you don't compress your tracks individually or reprint them at higher levels, you may have a great mix at an overall lower volume, pushing the master fader should help for a quick fix, but if this cures the level issue, try compressing and leveling each track to peaks prior to the first mix only lowering tracks which are too loud, when you get to mastering, all your signals are at their top potential for the CD.
Spend a few minutes burning samples at low, just below peak, and just above peak levels on separate tracks and playback in your boombox for reference to a commercial CD. You'll find little to no difference when you are in the sweet spot.
Another trick is to mixdown to a separate pair of tracks (not 23/24-16) and compress again during master mixdown rec. (ultimately 23/24-16)
Jeremy Yates, Radio World LLC.