As has been said, Biab is not a sequencer and you haven't said what version your friend has. If it's too old, he won't know anything about freezing tracks. It sounds like you're working with a midi file not a Biab song. When you load a midi file into Biab you can then tell it to extrapolate the chords from it but they may or not be very accurate depending on how complex the song is. Jazz tends to be complex and one thing people don't understand is chords are not part of the midi standard. This is strictly a function of Biab and Real Band. They have the ability to analyze a midi file and make pretty good guesses as to the chords but many times you still have to look at the chord grid and make corrections.

If you are working with an existing Biab song then trying to edit a song you didn't create and therefore you don't know exactly what went into creating it is a tough job for a noob to try to figure out in a day or two. What Biab is really known for is you creating a brand new song from scratch by selecting the style and entering the chords.

Instead of us taking you into the deep water trying to explain how to do something as specific as this, just tell us what you want to accomplish with Biab and we can tell you if it will do it or not. If we say yes it will then just buy it and it can take you some time to work with it to make it do what you want but at least you know it will do the job.

One big thing I always try to tell potential buyers is Biab is not designed to create exact covers of classic songs because no matter how well done style tracks are they're not going to create that classic piano intro to Joy Spring for example or the horn licks for Tunisia.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.