BobbyS wrote:Are you supposed to use headphones or loudspeakers?
Since part of the idea seems to be to loop them while you do other things, I'd favor speakers. For me, it's easier to treat something as background if I'm not using headphones.
OTOH, if you're used to carrying around a CD or MP3 player while you do other things, then try doing it that way. The tones may be more ... intense with headphones, and that may bother some people.