Hi,

2) Optical Raw switch - it is used for AC3 passthrough. Should by 
off for normal use (spdif out will play sound from pcm or alsa OSS 
emulation) or on (spdif out will play sound from spdif device - AC3 
stream - unaltered).
Why optical ??? Maybe because Optical and coaxial spdif output is 1 
physical output from DSP - they share this output.

3)IEC958 Coaxial - this is for optical and coaxial input.

Peter Zubaj



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