by DarkStar » Fri Jul 12, 2019 10:30 am
I am 99% sure that that would be OK.
To try it out, create another folder outside the main SampleTank sounds library folder, say "ST unused" with "Instruments/SampleTank 4" and "Samples/SampleTank 4" sub-folders. Move the folders for the unwanted category into there. For clarity, keep the hierarchy as close as you can to the original.
In ST4, you'll need to Rescan the Instruments, in Settings / Sound Content.
Then try it out. Some Multis may not work if some of their instruments are now missing.
If all is well, COPY the unused folders to a back-up disk; you never know, you might want them one day. Then you can delete them from wherever you created them above.
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PS If you can make sure you keep a back-up copy of the sounds download files (so you do not need to download them again) or of the complete installed sounds library.