User`s guide

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User's Guide Fireface UC © RME
17.5 Various Information
The current driver of the Fireface requires at least Mac OS 10.6.
Programs that don't support card or channel selection will use the device chosen as Input and
Output in the System Preferences – Sound panel.
Via Launchpad – Other – Audio MIDI Setup the Fireface can be configured for the system
wide usage in more detail.
Programs that don't support channel selection will always use channels 1/2, the first stereo pair.
To access other inputs, use the following workaround with TotalMix: route the desired input
signal to output channels 1/2. In the channel settings of outputs 1/2 activate Loopback. Result:
the desired input signal is now available at input channel 1/2, without further delay/latency.
Use Configure Speakers to freely configure the stereo or multichannel playback to any avail-
able channels.
18. Using more than one Fireface
OS X supports the usage of more than one audio device within an audio software. This is done
via the Core Audio function Aggregate Devices, which allows to combine several devices into
one.
The current driver supports up to three Fireface UC. All units have to be in sync, i.e. have to
receive valid sync information (either via word clock or by using AutoSync and feeding synchro-
nized signals).
• If one of the Firefaces is set to clock mode Master, all others have to be set to clock mode
Slave, and have to be synced from the master, for example by feeding word clock. The
clock modes of all units have to be set up correctly in the Fireface Settings dialog.
• If all units are fed with a synchronous clock, i.e. all units show Sync in their Settings dialog,
all channels can be used at once.
When using more than one Fireface UC the USB bus might get overloaded. To prevent this
connect all units to different USB busses.
Note
: TotalMix is part of the hardware of each Fireface. Up to three mixers are available, but
these are separated and can't interchange data. Therefore a global mixer for all units is not
possible.