Gefen GTB-HD-SIGGEN - Manual (Page 36)

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PATTERN SUMMARY
External Optical Audio Input
Changing the audio input to EXT OPTICAL, using the Audio Input Selection button
will produce the following screen:
In the example above, since no optical input was used, the Source Format Detection
displays None.
Internal Sinewave Generator
The third option (INT SINEWAVE) uses the internal sine wave generator:
NOTE:
The External Optical Audio Input does not support bitstream
t
decoding.