Read simulated VU meter

=> | -

<= | R0 = | most recent left channel VU
| R1 = | most recent right channel VU

This SWI returns data for approximating a VU meter. Each channel is a number between zero (silence) and 255 (loud) approximated from the amplitude of the data. As the VU data must be updated by the driver, the data returned may vary from driver to driver. The standard driver returns numbers proportional to the mean absolute amplitude over approximately 1 centisecond intervals.

This facility is experimental and currently rather useless!

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