i understand, but i often do this be manual entry because i’ve found the soloists prefer simpler timing and chords versus what i might put in HP. so importing the MIDI directly means i find myself editing the chords and some of the meter settings (like if you’ve ever had to re-enter chords when doing 5/4 etc - BIAB likes to split into many measures of 3/4 and 2/4, and entering chords can be a PITA then,)
to truly master BIAB takes many years, and i’ve heard productions from those folks and they don’t sound anything like the typical cheese you can get from BIAB. i don’t have the patience to master it, so i just use it for generating solos at this point.
one cool trick for BIAB though - styles. you can swap them on some genres and they’re perfect in either. example: country songs and reggae. take any one and convert to the other. perfect. try (for example) One Love in country style etc.
I dont see it as hiring a producer - more like hiring a load of session musicians
I have played with some stuff that can bring in patterns and you quickly run into the problem that they are great at building up stuff similar to existing styles. Where they fall short is when you want something that is outside of those styles. By the time you work at modifying to suit, it’s not that much of a leap just to write from scratch.
Of course that doesn’t help with things that you are not familiar with. You really don’t want to hear my efforts at drums. I don’t know enough about them to even do basic stuff. I just consider anything I use to just be a placeholder for someone who actually knows what they are doing to fill in properly.