Play Sound

As of GeoGebra 4.0, you can play sound in GeoGebra. You can play a sequence of notes by specifying the notes, or you can play sound from a MIDI file, or you can play the sound of a function. At Trigonometry - Music it is shown how to play the sound of a function.

Play notes

To play the note A in octave 5 using the instrument piano, use the command:

	PlaySound["A",0]

If you want to play a note in another octave than 5, you specify the number of the octave after the note. Specifying "A4" as note, plays the note A in octave 4. The names of the notes are the names used in the topmost applet on this page. If you want to use another instrument, change the second parameter to another integer. A trumpet has the number 56, the code PlaySound["A",56] plays note A using a trumpet.

You can play a sequence of notes by separating them by blanks in the first parameter. If you want to use different instruments for the notes in the sequence, specify the instrument m by I[m] before the note/notes. The code PlaySound["A B C",0], plays the notes A, B, C using a piano. The code PlaySound["I[0] A B I[56] C", 0], plays A and B using a piano, and C using a trumpet.

Play a MIDI file

You can play a MIDI file (.mid-file) by using the command PlaySound["filename"]. You turn off the sound that is currently being played by using the command PlaySound[false], and you resume playing the sound using the command PlaySound[true].

Using the command PlaySound[true] may cause trouble on a web page. By turning several sounds on and off, you may get to a situation where two songs are playing and you cannot turn them off. Also note that if this happens, navigating to another page does not turn off the music.