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→Clock Options/SPDIF Source
=== Clock Options/SPDIF Source ===
The interface usually has the option to select the '''SPDIF clock source ''' as ''internal '' or ''external '' (''master '' or ''slave''). Many devices require being the clock source; and in this case, you must select external or slave as well as setting the correct sample rate to sync with the device.
Otherwise, you should use internal/master and set the sample rate at the rate that you want to record in. The DAW may be able to override this value, but it's best to set it to the same to keep everything consistent and minimize confusion and risk of error.
'''Lower sample rates means smaller file sizes for storing DAW tracks and less CPU power needed to apply plugins or handle numerous audio tracks.'''
For interfaces that have both coaxial and TOSLINK SPDIF input, you should be able to select which ones you are using for input and output.
'''Note: the sample rate selected ''does not'' affect the operation of the A>D converters. These always operate at the device's maximum sample rate, providing the highest quality A>D conversion. ''' The signal is then digitally scaled down to the selected sample rate, without any loss of quality, other than the removal of frequencies above the Nyquist frequency. Lower sample rates means smaller file sizes for storing DAW tracks and less CPU power needed to apply plugins or handle numerous audio tracks.
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