Yamaha CS1D Operating Manual page 405

Output channels
2 On/off buttons
These buttons switch dithering on/off in two-chan-
nel units for each output slot of the output unit.
3 Bit number
These buttons select the number of valid bits in two-
channel units for each output slot of the output unit.
Dithering will be applied to bits below the value you
specify.
You can select from a range of 24 bits – 16 bits.
You can make this setting even if a unit is not con-
nected. The number of valid bits will differ depend-
ing on the output card, so you must be sure to
check this. Otherwise, noise may occur.
2 3
SYS/W.CLOCK (system/word clock) function
Output slots
57