1. One way that it can be used is for it to be plugged into the generator, and then one would select what frequencies (in audio range) they wished to run. Audio range is 20 Hz to 20,000 Hz. The preset sets limits to ensure any frequency outside of this range is reduced to a harmonic that is in this range. Mind you, humans loose their top end hearing as we age and you may not be able to hear past say 14,000 - 17,000 Hz depending on age and other factors. We also tend to feel the very low frequencies vs. hearing them -- 20 - 35 Hz. The audio produced will invoke an entrainment process -- especially good at brain wave entrainment for instance.
2. The Songs Of The Spine audio files that Dr Pankaj Mishra posted last night would be perfect played through the night as they are quite soothing.However I don't know what the connections are as to whether they have a regular audio socket.
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