My understanding is that when RealTracks were first introduced one set of RealTracks would include many more individual files than what are needed today to create the same RealTracks set.

Open Band-in-a-Box and click on the "About" button and you'll see:
Quote:
- This program uses élastique Pro by zplane.development as time stretching and pitch transposition engine. More info: www.zplane.de (Version 3.1.11)


The elastique Pro feature enables Band-in-a-Box to change the pitch or timing of an audio file. As Zplane improves the feature some of the audio files formerly required are no longer needed and are redundant. "Erase un-needed files" gets rid of the redundant files.

If you started using Band-in-a-Box in just the last few years then your computer likely does not have the redundant audio files as PG Music quit including them as they became redundant.


Jim Fogle - 2024 BiaB (1111) RB (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