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P3 here.
I tried using the Sound library but gave me the error "This library may not me properly installed", blah, blah, 64bits, blah...
I had the same error with the video one, but moving the folder to C:\ (I mean, with only english ASCII characters, no ñ or á), it worked. Now I don't know what the heck is going on with the Sound one :/
Answers
Same for me, w/ Japanese characters in the path to my project dir.
Please let the developer know the details so he can fix it: https://github.com/processing/processing-sound/issues