RME Fireface UCX II 40-Channel USB-B Audio/MIDI Interface - Manual (Page 35)

User's Guide Fireface UCX II © RME
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15.5 Various Information
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 sig-
nal 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 availa-
ble channels.
16. 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 UCX II. All units have to be in sync, i.e. have to
receive valid sync information either via word clock or by feeding synchronized 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.
Note: TotalMix is part of the Fireface hardware. 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.
Please be aware that operating more than one Fireface UCX II may cause resource problems
on the computer side.