User's Guide Fireface 400
© RME
23
12. Operation and Usage
12.1 Playback
The Fireface 400 can play back audio data in supported formats only (sample rate, bit resolu-
tion). Otherwise an error message appears (for example at 22 kHz and 8 bit).
In the audio application being used, Fireface must be selected as output device. This can often
be found in the
Options, Preferences
or
Settings
menus under
Playback Device, Audio Devices,
Audio
etc.
We strongly recommend switching all system sounds off (via >
Control Panel /Sounds
<). Also
Fireface should not be the
Preferred Device
for playback, as this could cause loss of synchroni-
zation and unwanted noises. If you feel you cannot do without system sounds, you should con-
sider buying a cheap Blaster clone and select this as
Preferred Device
in >
Control Panel
/Multimedia /Audio
<.
The screenshot shows a
typical configuration dia-
log of a (stereo) wave
editor. After selecting a
device, audio data is sent
to an analog or digital
(ADAT / SPDIF) port,
depending on which has
been selected as play-
back device.
Increasing the number
and/or size of audio buff-
ers may prevent the au-
dio signal from breaking
up, but also increases
latency i.e. output is de-
layed. For synchronized
playback of audio and
MIDI (or similar), be sure
to activate the checkbox ‘Get position from audio driver’.
The Fireface’s ADAT optical interface supports sample rates of up to 96 kHz using a standard
ADAT recorder. Single-channel data at this frequency requires two ADAT channels, achieved
using the
Sample Multiplexing
technique. This reduces the number of available ADAT channels
from 8 to 4. Under Windows MME, channels are routed to ADAT devices in double-speed mode
as follows:
•
Only the four stereo pairs of the device ADAT1 are available
This kind of implementation allows a problem-free usage of the ADAT port in Single and Double
Speed, as the routing for ADAT doesn't change. However, the hardware spreads the data dif-
ferently:
•
Channel 1 is transmitted via channels 1 and 2, channel 2 via 3 and 4 etc.
Please refer to the diagram in chapter 18.2. Routing for record and playback is identical.
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