Not true Matt. For example I've attached a screen shot of the PG Music Patch Map webpage with the entry for Roland's VSC soft synth highlighted.

A patch map can be created for any soft synth or sound module that has documented higher patch banks.

Cooltouch, Band-in-a-Box does not have a built-in soft synth. You can select a soft synth in preferences (Ctrl+E MIDI Driver). However for some tasks Band-in-a-Box uses the computer's operating system midi patches. Both Windows and Macintosh have built-in midi patches that are GM compatible so a patch map is not needed when they are used.

Notice there are many keyboards listed in the drop down list along with soft synths. Again if you select a keyboard from the list it would need to be connected to hear any midi playback.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Clipboard01.jpg (306.88 KB, 60 downloads)
PG Music PAT and INI file for Roland Virtual Sound Canvas (VSC) soft synth
Clipboard02.jpg (470.17 KB, 60 downloads)
Ctrl+E (preferences) > MIDI Driver > Soft synth settings

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