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Primitive	Alt	Action
SetInstrument x	SetInstr	Set the instrument sound.
Sequence [..list..] Play SetIndexSequence x DeleteSequence	Seq SIndSeq DelSeq	Put sequence list into memory. Play sequence. Set cursor index position in current sequence. Delete sequence from memory.
PlayMP3 "name StopMP3 "name		Play MP3 file "name. Stop playing MP3 file "name.w

Underlined Set can be removed from a primitive name in order to return information.
eg. SetHeading sets the heading of the turtle. Heading returns the heading of the turtle.

The note names used are:
Doh, Ray, Me, Fah, Soh, Lah, Te

A complete list of available instruments can be found at Tools / Preferences / Sound tab.
You can also select or change a sound from the list. Sometimes, the list doesn't show, but you can still use sounds in your programs. Here is a quick sound test:

To Test
  Seq [0.5 Soh Lah Te Soh]
  Play
End