
User's Guide Fireface UCX © RME
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31.2 Class Compliant Mode under Windows and Mac OS X
On a Windows PC, Class Compliant mode is indicated by a missing “RME“ in the device name
shown in the Device Manager. In the correct mode and with installed drivers, the full name in-
cluding RME is shown, without serial number.
Windows does not support USB Audio 2.0 directly. The UCX will be detected, but automatic
driver installation will fail. This is important to remember. Connecting it to the PC one day after
having it used with the iPhone/iPad one might forget that it is still in CC mode. You might end up
with hours of wasted time trying to repair your driver installation – when all you need to do is set
the unit back to normal mode.
Mac OSX supports USB Audio
2.0, even with more than 2
channels. The UCX offers 18
input and 18 output channels at
up to 96 kHz. It is shown as
“Fireface UCX (xxxxxxxx)“ in the
Audio MIDI Setup, in both
normal and CC mode. In CC
mode the USB Settings will
vanish from the Dock, and
TotalMix will – if at all – show a
‘disconnected’ UCX.
The Audio window in the Audio
MIDI Setup lists two available
modes: 2 channels and 18
channels. The sample rate
shown here as ‘Default’ is the
one set at the UCX.
Alsa (Linux) does not work with USB 2 Class Compliant interfaces at this time, but it seems it
can be fixed (recompiled) to do so. More information is available here:
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