Korg Soundlink DRS OASYS PCI User Manual page 130

ASIO Control Panel/ Audio Settings
In general, it's best to leave the Input Level set to 0dB, and attenuate only when
necessary to avoid digital clipping. If you're using an external mixer, you may find
it more convenient to reduce the output level of the mixer.
Output Level
MUTE, -72.1 dB to 0dB. This controls the gain of the analog outputs. At the
default value of 0dB, the volume will be unchanged. At lower values, the volume
will be reduced.
Record Source
The OASYS PCI allows you to record from either the audio inputs, or the output of
the OASYS PCI mixer.
Audio Inputs
When this option is selected, the digital audio program will record from the audio
inputs of the OASYS PCI. This allows you to record audio from any external
source connected to the analog, S/PDIF, or ADAT inputs.
Mixer Outputs
When this option is selected, the digital audio program will record from the
outputs of the OASYS PCI mixer. This allows you to record OASYS PCI
synthesizers, and audio processed through OASYS PCI effects, without making
any external audio connections.
The mixer outputs are routed to the corresponding inputs in the digital audio
program, so that mixer output ADAT 3-4 is heard at input ADAT 3-4, and so on.
You can even simultaneously record audio inputs along with processed audio and
synthesizers, simply by assigning OASYS PCI mixer channels to the desired audio
inputs.
Audio Buffer Size
64, 128, 256, and 512 samples. This sets the size of the buffers used when sending
audio data between the OASYS PCI and digital audio programs.
Smaller settings allow you to decrease CPU input-to-output latency, at the expense
of slightly higher CPU loading.
Larger settings allow you to maximize CPU efficiency, at the expense of higher
CPU input-to-output latency.
Depending on the speed of the CPU, the amount of CPU-based plug-ins you are
running, the speed of the audio disk, and other factors, some computers may
require higher Audio Buffer Size settings than others. Settings which are too small
may cause clicks or other audio artifacts. You may need to experiment to find the
best setting for your system.
After changing this setting, you'll need to reboot before using the OASYS PCI.
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Reference
OASYS PCI