It's a black box. There is a Zane Carney video where he states he is in the process of recording his RealTracks for PG Music but that's about it.

The most closely related activity is to walk through the process of how to make a UserTrack. UserTracks can be thought of as a type of RealTrack that is made by anybody but PG Music. Only PG Music can make RealTracks because RealTracks is an idea they invented and they are not sharing the secret sauce ingredients. +++ HERE +++ is a tutorial page that has some suggestions about how anyone can go about making a UserTrack.

Press F5 to open the Bar Settings window, then select the UserTracks Development button, to open a UserTracks Development Settings window. These settings are some of the guidelines Band-in-a-Box follows when selecting what UserTrack audio snippet to use. The suspicion is there are similar RealTrack guidelines.

Most session musicians can maintain a very steady bpm speed without having to rely on a click track. However it is common to have one available as a reference just in case. I believe the ability, or inability, to maintain a steady speed is the most obvious difference between listening to the playback of a RealTrack and a UserTrack. Most amateur musicians do not have the practice time needed to develop their internal clock to the precise timing needed to make a time accurate long duration recording. One way to work around this limitation is to record MIDI, quantize the MIDI data and record the audio of a midi player.

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Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home