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I would recommend you to use Pins 2 and 3 of the Galileo board. These pins generate the most accurate tones. Other pins will not work as well as pins 2 and 3 because of the IO speed limitation of the Cypress expander chip.
Thank you, Sergio.
One more question, I would like to know the max frequency I can get (from pin 2 and 3) using tone( ) commands.