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

Here's another take on Rodney's original program; this moves the note timing into the interrupt as well so you can simply start a note and move on to something else. Ultimately, I'd like to add a note buffer so that you could queue up a few notes to play while your foreground is doing something else.

Note: I recalculated the pitch values based on a 4 uS interrupt cycle for better accuracy, and used a slightly different strategy than Rodney.  My pitch calculations are based on a standard formula for converting MIDI note values to frequency.  My Excel file is attached, too.

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