I trick I use a lot is to generate a song, or songs until I find one I like.. in Biab..

Then I create several versions using different styles.. I carefully label these saving as song and MID..

I import the midis into Logic, again labeling them.. Labeling is critical.. I might copy in five versions of song

I always create a utility organ style, so I have the block chords of song..

I line up all the five different basses,, I cut them into one bar lengths, and then manually mute and select the one bar section.. so I have a bass part with up to five different styles.. I do this with some of the other tracks..

I use the super midi parts when possible, because they are so much more impressive..

I also might create several versions of the song with different melodies, and solos. again careful labeling is essential.. I might use different melodies in different parts of songs even spitting them into one or two bar sections... Sometimes I find so much great stuff, I lengthen song.. double length verses, or extra verses .. This is where the careful labelling goes in.. I now make a composite of the chord track, and perhaps bass, and another instrument of two.. I import this midi into BIAB and do process again. .

It can easily get overwhelming. can but can yield some amazing results.. I also use a Tyros 5 arranger kbd, which is no slouch at creating parts..

I sometimes take what I've assembled. learn to play it and replace that with my hand played performance..
I use Macs, desktop picture taker, and write text notes and save all in a folder, so I can come back and continue in working..