RME Audio Fireface 400 User Manual page 17

Buffer Size
The setting Buffer Size determines the latency between incoming and outgoing ASIO and WDM
data, as well as affecting system stability (see chapter 13).
Bandwidth
Allows to reduce the amount of bandwidth used on the FireWire bus. See chapter 11.6.
All channels (default) activates all 18 input and output channels
Analog + SP. + ADAT 1-4 activates all 8 analog channels plus SPDIF plus 4 ADAT channels
Analog + SPDIF activates all 8 analog channels plus SPDIF
Analog 1-8 activates only the first eight analog channels
The string Errors does not refer to buffer errors, but FireWire transmission errors. The display
will be reset on any start of a playback/record. More information can be found in chapter 35.3.
Output Format
Word
The word clock output signal usually equals the current sample rate. Selecting Single Speed
causes the output signal to always stay within the range of 32 kHz to 48 kHz. So at 96 kHz and
192 kHz sample rate, the output word clock is 48 kHz.
Optical
The optical TOSLINK output can operate as ADAT or SPDIF output.
SPDIF
The SPDIF output can have the Channel Status Consumer or Professional. For further details
please refer to chapter 28.2.
SPDIF Input
Source
Defines the input for the SPDIF signal. 'Coaxial' relates to the RCA socket, 'Optical' to the opti-
cal TOSLINK input.
TMS
TMS activates the transmission of Channel Status data and Track Marker information from the
SPDIF input signal.
Clock Mode
Sample Rate
Sets the currently used sample rate. Offers a central and comfortable way of configuring the
sample rate of all WDM devices to the same value, as since Vista this is no longer supported to
be done by the audio program. However, an ASIO program can still set the sample rate by it-
self.
At ongoing record/playback the selection is grayed out, so no change is possible.
Clock Source
The unit can be configured to use its own clock (Internal = Master), or one of the input signals
(Word, Optical, SPDIF coax., LTC = Slave). If the selected source isn't available, the unit will
change to the next available one (AutoSync). If none is available then the internal clock is used.
The current clock source is displayed to the right.
Pitch
More information on Pitch is available in chapter 11.3.
User's Guide Fireface 400 © RME
17