Korg Soundlink DRS OASYS PCI User Manual page 134

Wave Device Settings (Windows)
Clock
Clock source
When connecting multiple digital audio devices–such as the OASYS PCI, an
ADAT system, and a S/PDIF device–it is important that the word clocks of the
devices be locked together. If the clocks are not locked, the audio may be marred
by pops and clicks. The OASYS PCI can lock to incoming clocks from any of its
digital inputs, or it can generate its own clock internally. For more information, see
"A few words on word clock," at the end of the System Configurations section of
the Installation Guide.
You may need to select different clock sources from time to time, depending on
what you are currently doing with the OASYS PCI; see the "System
Configurations" section of the Installation Guide for details.
ADAT. The ADAT optical input will provide the master word clock.
S/PDIF. The S/PDIF input will provide the master word clock.
Word Clock. The BNC word clock input will provide the master word clock.
Internal Clock. The OASYS PCI's internal clock will be the master. With this
setting, the Sample Rate parameter, described above, controls the clock.
Sample rate
This parameter has two functions. First, it sets the clock rate when the Clock
Source parameter, described above, is set to Internal. Second, it sets the sample
rate information embedded in the S/PDIF output data, which in turn sets the
sample rate of any connected S/PDIF devices.
When transferring audio from the ADAT inputs to S/PDIF output, it is important
to set this parameter so that it matches the sample rate of the ADAT. Since original
ADATs used their pitch controls to choose between 48kHz and 44.1kHz, the
OASYS PCI cannot be sure of the sample rate of ADAT input. Setting the Sample
Rate parameter lets the S/PDIF device know what rate to expect. If this parameter
is set incorrectly, the connected S/PDIF device may not function properly.
VERY IMPORTANT: The sample rate affects the processing power available to
the OASYS PCI. You'll get about 8% more processing power for synthesizers
and/or effects at 44.1kHz than at 48kHz.
44.1 kHz. The internal sample rate will be set to 44.1kHz. Also, the S/PDIF sample
rate information will be set to 44.1kHz.
48 kHz. The internal sample rate will be set to 48kHz. Also, the S/PDIF sample
rate information will be set to 48kHz.
Synchronization
Through the standard Windows driver, each of the OASYS PCI's stereo input and
output pairs appears to the system as an independent wave device. The digital
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Reference
OASYS PCI