* calc/calc-units.el (math-midi-round, math-freqp, math-midip)
(math-spnp, math-spn-to-midi, math-midi-to-spn, math-freq-to-spn) (math-midi-to-freq, math-spn-to-freq, calcFunc-spn, calcFunc-midi) (calcFunc-freq, calc-freq, calc-midi, calc-spn): New functions. (math-notes): New variable. * calc/calc.el (calc-note-threshold): New variable. * calc/calc-ext.el (calc-init-extensions): Add keybindings for calc-spn, calc-midi, calc-freq. Add autoloads for calcFunc-spn, calcFunc-midi, calcFunc-freq, calc-spn, calc-midi and calc-freq. * doc/misc/calc.tex (Musical Notes): New section. (Customizing Calc): Mention calc-note-threshold.
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