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fox 2 growler tone

This micro-controller uses 4 buzzers (the settings for them are in the description of the node) to mimic the growling tone IR missiles have in a fighter cockpit.

An example of how to set it up can be found here: https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2912527837

-- due to the audio update the passive tone does not sound as good, however thanks to the new buzzer sounds i was able to make the lock tone sound better. Unfortunately there isn't a way to go back to the original method because of how pulsing buzzers work in the new version.