A couple of years ago I read a post that explained a simple method to remove duplicate sound pools. Unfortunately I have forgotten how and I cannot find that post. I will say up front, the accepted answer of Settings->Reset/Cleanup Soundpools does not work.
In another instance of this fairly oft-asked question, a young user outlined a way to do it via editing the SoundPoolDB.dat file. While an admirable endeavor, it is definitely NOT for the faint of heart and if you do not know what you're doing you'll find yourself reinstalling the whole program. Via his suggestion, however, I did learn why "90s Eurodance Vol. 1" was duplicated: I have the one from SoundPool 19(?) and I have, as a result of getting for free MMM Soundtrack Edition, Basics_19 which has a scaled-down copy of that one. 3 copies of "Electric Jazz Vol. 1" remain a mystery.
The previously mentioned "lost" method involved selecting the "offending" duplicate and, using a simple key combination, deleting it. I just cannot remember the key combination. It wasn't "Delete" or anything that simple. It's right on the periphery of my memory but it remains just a hair beyond my grasp. Something like Shift+....something!!!
Anyone else rmember this????
Thanks!