RealBand silently uses a helper file in the background to render RealTracks. The helper file appears to be a modified version of the Band-in-a-Box executable. If that is the case, then the helper file will have the same limitations as the main file.

The plugin also uses a helper file which appears to be another variation of the main file.
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Jim Fogle - 2022 BiaB (914) RB (Build 1) Ultra+ PAK
Cakewalk - Zoom MRS-8 recorder
Desktop: i7 Win 10 build 2004, 12GB ram 256GB SSD, 4 TB HDD
Laptop: i3 64bit Win 10 build 21H1, 8GB ram 500GB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home