Some thoughts...
- If you haven't already, create a Your Songs album Folder. Place your existing Logic project folder into it.
- Bounce each of your tunes in your Logic song project to 24 bit 44.1k stereo Aiff (no dither), and no effects on the master bus. Add a one bar at the start, and enough length at the end to capture any reverb tails. Add something to their names to indicate that they are unprocessed ST files. You now have final mixes that could be mastered more professionally later. It's very challenging to try to master stereo tracks that already have significant amounts of processing on the main output bus, as the file have already been cooked so to speak.
- Import these 24 bit files into a new Logic project called Your Songs_Premastering. I would save this project to a new folder called Premaster within Your Songs (YS) album folder. You could add them to one track with a few bars gap in between them. I would also create colorful markers for each one.
Or add each to their own track. In this case, you can more easily compare RMS and Peak levels for each song, side by side in the Mixer by using the mute and solo buttons. Aim for a volume level of between -12 to -6 dB on each tune.
- If there are some volume differences, you can add a Gain plug-in to the tracks which need a volume boost for more even levels between the tunes in relation to the one that is already in the -12 to -6 level.
- Now add effects in the Main Output inserts: Perhaps EQ first for low end roll off before compression (to avoid a bass boost) then gentle Eq for tone shaping followed by the MultiBand limiter, and finally the Adaptive limiter. Or the single band compressor with a low ratio and threshold, EQ, then Adaptive Limiter. Better yet, explore the factory Mastering Channel Strips that are available in Settings pop up on the main Stereo out.
- Bounce again to 24 bit, 44.1 K stereo aiff with no fades and no dither. Name files to indicate bus fx but no trim or fades
- At this point you would bring the pre-mastered files into Waveburner for trimming start and end times, fades, and dithering down to 16 bit. That not being the case, Import the files into yet another Logic project named Mastering, saved to a folder named Mastering inside the YS folder.
Trim the start and ends of the files. You can now add fades at the end if needed. Of course, no effects on the main output.
Bounce to PCM AIFF 16 bit 44100 with dither added. (Experiment using POW-r #2 or POW-r #3). Name them to indicate 16 bit masters...
Set iTunes to import AIFF, import your 16 bit masters, create a Playlist, then burn to disc.