Playing the same audio file twice in Quick Look often adds an annoying "fade in" effect which makes it impossible to browse samples and comparing sound files by up/down arrow keys. This is especially problematic when dealing with short samples (like hihats for instance), in which you may not even hear the sound the second time you're playing it.
Again, this is mostly affecting Quick Look when using arrow keys. If you play a file, then hit space (closing Quick Look) and wait for about a second, you might hear the full sound once again. But this whole flaw is really making Quick Look less useful for previewing short sound files.
I'm either looking for a way to 're-engineer' Quick Look (though I don't know if there are any settings or something to alter), or any 3rd party extension/plugin that might alleviate or fix the problem.