tone(pin, freq, duration)

[microwattbott]

While testing an early beta version of piezo_music.py,
I struggled to understand that freq had to be an integer.
The program's float value is not going to make the tone() function work.
@tannewt suggested that we try to "fix tone to either handle it or produce a friendly error message."

RE: \Metro Experimenter Guide\METROX-Examples-and-Project-Sketches-master\circuitpython\CIRC06\piezo_music.py

[brentru]

Thanks for the feedback! I'm going to wire up the circuit for piezo_music.py and fix it per @tannewt's suggestions (thx for including those btw!)

[brentru]

Tone function has been changed, and piezo_music.py in the MetroX circuit examples has been updated.