What you need to implement for Fuse's low-level sound routines
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Fuse's sound routines require three functions to be implemented:

* int sound_lowlevel_init( const char *device, int *freqptr, int *stereoptr )

Initialise the sound card etc. If 'device' is non-null, use the device
specified there, otherwise use a sensible default. '*freqptr' and
'*stereoptr' give desired states for the output frequency and
stereoness respectively, and should be set to the values actually
obtained from the hardware.

void sound_lowlevel_end( void );

Close down the sound card etc.

void sound_lowlevel_frame( libspectrum_signed_word *data, int len );

Write the 'len' 16-bit items of sound data in 'data' to the sound hardware.

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