In SX Microcontrollers, SX/B Compiler and SX-Key Tool, rodneymc wrote:

The sx should be able to easily do this with the pitch vp in software and minimal RC hardware.

 

[url=http://forums.parallax.com/forums/default.aspx?f=7&m=283554]http://forums.parallax.com/forums/default.aspx?f=7&m=283554[/url]

 

2 notes to generate dtmf in the interrupt should be easy to implement - just a small increase to your interrupt.  I think Jon actually did a polyphonic version in the thread.

 

I've been able to do up to 4 simultaneous notes playing music the same time, using a similar concept.  I'm sure more can be done, as most of the interrupt I was using to calculate note durations for each track.

 

Use the filter circuit (RC) shown in the piezo buzzer to smooth out the square wave.

 

Let us know if you have any questions and/or how it goes!

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