Through experimentation and a trained ear, I found that the Picaxe Basic function "sound" provides audible notes in a range of chords starting at a frequency of 40 and increasing by one full step in increments of 6, plus or minus a value of 2--one full octave higher than tone 40 is at 84.
Equipped with this knowledge, I can begin programming basic sheet music into the picaxe's memory.
**UPDATE** 3:56pm
Using a digital tuner I was able to confirm that tone 40 and tone 84 are in fact the musical note "A"
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