Yes, it depends on what you intend to do or what your need or interest is at the moment.
Lowest frequencies are good for very deep meditation, lucid dreaming, hypnosis, deep relaxation, etc.
As you move up in frequency you will discover certain ones are good for focus, learning, treatment for things like ADD, etc.
Even higher frequencies may be good for getting "hyped" for a big sport event if you're an athlete.
Currently little is known about frequencies called "gamma" which are 40 and above because until recently, instruments such as EEG could not accurately measure those frequencies.
This is a fascinating area of study. More discussion on it by "explorers" more advanced than I would be most welcome.
Charles
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