Korg Soundlink DRS OASYS PCI User Manual page 86

Output Busses
Also, other Output Busses can be summed into the Master Bus, using the To
Master button, as described above.
Default Master Output Bus preferences
The Preferences window "Master Output Bus" parameter allows you to set a
default Master Bus, which is used whenever you create a new Multi.
You can also use the Preferences window "Reset Master Output Bus When
Opening Multis" parameter to automatically set all Multis to use the default
Master Bus. Use this feature if you always want to audition sounds through a
specific Output Bus.
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Reference
OASYS PCI