*PlayIt_Play [<file>]
If no parameter is given a previously paused sound is resumed (an error is generated if no file is currently open).
If a file as passed as parameter PlayIt first tries to identify the format and extracts the required paramaters. A detection failure is reported as an error otherwise the sound starts playing. Any currently playing sound is first stopped.
This command is equivalent to the following SWI sequence:
PlayIt_Open
R0=<file>, R1=0
PlayIt_Play
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