GitHub - daniel-centore/arduino-tone-library: Produces a square wave of specified frequency on any arduino pin
GitHub - connornishijima/arduino-volume1: Arduino tone() just got 8-bit volume control - with no extra components!
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Beep Piezo Buzzer in Certain Invervals With Arduino Uno and Tone() Library. : 3 Steps - Instructables
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Arduino Tone Generator With No Library or Serial Functions (With Interrupts) : 10 Steps - Instructables
![Amazon.com: On the Sensations of Tone as a Physiological Basis for the Theory of Music (Cambridge Library Collection - Music): 9781108001779: Helmholtz, Hermann L. F., Ellis, Alexander J.: Books Amazon.com: On the Sensations of Tone as a Physiological Basis for the Theory of Music (Cambridge Library Collection - Music): 9781108001779: Helmholtz, Hermann L. F., Ellis, Alexander J.: Books](https://m.media-amazon.com/images/I/61k-ZL0v39L._AC_UF1000,1000_QL80_.jpg)