These .wav files won't produce any sound in LMMS. They work fine when I play them in the Media Player and other .wav files are completely fine, it's just this sample pack.
Tutorial - How to import a sample in LMMS (1 minute tutorial) - YouTube
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How to load/import samples in LMMS - YouTube
Linux MultiMedia Studio (LMMS) by LMMS - Virtual Studio Plugin VST LADSPA DSSI
LMMS 1.2.0: When Four Years of Waiting Pays Off | Linux Addicts