Welcome, GildfordMusician. The basic program is the same in all the versions, the difference is the amount of included styles and real tracks. BIAB can produce midi or audio tracks - the ability to produce audio tracks is dependent on having the real tracks (including the so-called real drums). The higher packages include more real tracks and real styles. The Pro version is kind of a bare bones package without many styles or real tracks. You're probably better off to get the highest level package you can possibly afford. PG Music does generally offer upgrade prices, but you'll end up spending less if you buy higher level package to start with generally. They do also I believe still offer 30 day money back policy, if you'd like to try the program for 30 days.

good luck


Macbook Pro 2018
2.6 GHz 6-core Intel Core i7, 16 GB RAM
OS Monterey
BIAB for Mac 2022