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reduced python source for embedded apps

Programs that demonstrate the use of the audio device on the SGI 4D/25.
These require the built-in module 'audio'.

XXX This hardware is already obsolete; see ../al for examples of audio
XXX on the Indigo and 4D/35.

play		Read a sound sample from a file and play it through the
		speaker.  Options to set volume, sampling rate etc.