Using o1.play for MIDI Sound

The function o1.play plays MIDI music given as Strings that describe notes. Below is a summary of the notation used in the Strings that you can pass to play.

• "cdefgah" plays seven notes at the default tempo of 120. (N.B. the seventh note is h, not b.)
• "CDEFGAH" plays them louder.
• "CDEFGAH/240" plays them at a double tempo of 240.
• "CD E" has a pause between the second and third note.
• "CD-E---" has a longer second note and a longer still third note.
• "C.D.E" produces a staccato-like effect on the first two notes (playing them shorter followed by a pause).
• ">CDE<<<CDE" plays three notes in a higher octave then shifts three octaves down before playing them again.
• "C7D3E" plays the c in Octave #7, the d in Octave #3, and the e in the default Octave #5.
• "CbDBE#7F" has a c-flat, a d-flat, an e-sharp in Octave #7, and a natural f. b and B are equivalent.
• "C♭D♭E♯7F♮" is a fancy-pants way of writing the same thing.
• "CDE[13]CDE" plays three notes using the default Instrument #1, then again using Instrument #13.
• "(CEG)(DF#A)(EG#H)---" plays three chords, the last of which is longer.
• "CDE&<<[28]efg&[110] F" simultaneously plays the three parts separated by &s.
• "P:CDE" uses the MIDI percussion channel: each "note"` represents a different percussion instrument.
• "C|D||||E" means the same as "cde": the |s don’t do anything, but you can use them to mark bars or whatever.

For a numbered list of the instruments, see the General MIDI Sound Set. The Instrument object contains the same list as Scala constants.

(Side note: The content on this page will eventually be moved to the API description of package o1.sound.midi, but it’s here while Scaladoc3 doesn’t properly support top-level documentation for packages.)