by, who is indebted to Jan Vriend and Jan Pieter Kunst. Version 2.0.1. Documentation.
Originally written in Pascal (1993); PHP port & web interface ©
2006-2020 by Jan Pieter Kunst. Download or view
the source code.
MIDI support: Midi Class 1.6 by Valentin Schmidt and MidiPlayer by chenx.
Format something like: d4-g#4-c#5, or f4db4bb3ab4,
each note name to be ended by its octave position digit (a440 = a4)