Tone AC (toneAC.h)

https://code.google.com/p/arduino-tone-ac/ -- Replacement to the standard tone library with many advantages Nearly twice the volume (because it uses two out of phase pins in push/pull fashion) Higher quality (less clicking) Capability of producing higher frequencies (even if running at a lower clock speed) Nearly 1.5k smaller compiled code Bug fixes (standard tone library can generate some odd and unpredictable results) Can set not only the frequency but also the sound volume Less stress on the speaker so it will last longer and sound better Disadvantages are that it must use certain pins and it uses two pins instead of one. But, if you're flexible with your pin choices, this is a great upgrade. It also uses timer 1 instead of timer 2, which may free up a conflict you have with the tone library. It exclusively uses port registers for the fastest and smallest code possible.

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Examples

2016-01-25 tzikis

I think you'd need to start by cloning this library and replacing TIMSK1 with TIMSK2 (or whatever the equivalent for Timer 2 is), but usually there are other changes that also need to be done in such complex libraries
2016-01-05 howard.j.may

What would be required to make this use T2 (Nano pins 3, 11) rather than T1 (Nano pins 9, 10)?
2015-11-19 codebender

This library and its examples were tested on 2016-06-11 with common Arduino boards. For more detailed information about the test results, please look at each example's comments.