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I really hope you get an ID for Unknown2#Ambient techno 92_ 1.mp3 !

Is it possible the WBMX one is on Raze - Let The Music Move U (12") at Discogs ?

If you have your sets as MP3s already, and you have Windows, then you should just use mp3DirectCut to crop the files as needed. It takes some getting used to, but is the only lossless editor for MP3s...