=> R0 = pitch value
14-12 3 bit octave number
11-0 12 bit octave fraction (1/4096ths of an octave.)
<= R0 = (entry R0 < &8000) 32 bit phase accumulator value
(entry R0 => &8000) preserved
This SWI maps a 15 bit pitch value to an internal format.
See PRM 4, page 38.
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