I think I am best served taking the longer path and working with a DAW.
I will use Logic Pro X

I watched a video on LogicProX of both the Loudness meter (LUFS) and a limiter built into the product. I understand better how to use these tools together to obtain a target output volume.

I will start by taking an arrangement in biab, doing a basic volume mix, export each track as single wav files, load into Logic and begin my work.

Very basic questions regarding biab mixer to produce the best wav files for Logic

I'm concerned about saturating (clipping) the tracks with high volume.
It appears I have that problem with my existing tracks.

What "loudness" should I shoot for on each track?
How far into Yellow/Red should I let each meter get on the individual tracks
What about Master out? Should master out be where I manage "target" wav volume?

Should I normalize my wav files inside biab?
Should I include ACID info ?
Should I take dry tracks or put a little reverb inside biab.

I will do any track panning in Logic.

I think my target output will be stereo wav files. I can play these out the ipad/iphone and with a direct box split the stereo into 2 channels. that gives me panning volume control for bass/drums during peformance as JazzMammal suggested.

I'm glad I have plenty of disk space.

To all who have helped, sincerest thanks.

biab2024(Mac) Latest Build
Mac OS Sequoia 15.0.1
Apple M2 pro 32GB Ram
Logic Pro 11