BrightSign Object Reference Manual (FW 5.1) - Manual (Page 53)

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audio_output values
0 – Analog audio
1 – USB audio
2 – Digital audio, stereo PCM
3 – Digital audio, raw AC3
4 – Onboard analog audio with HDMI mirroring raw AC3
digital audio values
0 – Onboard HDMI
1 – SPDIF from expansion module
audio_mode values: Options 0 and 1 only apply to video files; while 2 applies to all audio sources.
0 – AC3 Surround
1 – AC3 mixed down to stereo
2 – No audio
3 – Left
4 – Right
mapping values: Used to select which analog output to use if audio_output is set to 0.
0 – Stereo audio is mapped to onboard analog output
1 – Stereo audio is mapped to expansion module leftmost output
2 – Stereo audio is mapped to expansion module middle output
3 – Stereo audio is mapped to expansion module rightmost output