RME Fireface UCX II 40-Channel USB-B Audio/MIDI Interface - Manual (Page 96)

96 User's Guide Fireface UCX II © RME
33.2 Class Compliant Mode under Windows and Mac OS X
The Class Compliant mode of
the UCX II is not compatible to
Windows. The UCX II will be
detected, but automatic driver
installation will fail.
Mac OS X can be used in Class
Compliant mode, although with-
out Settings dialog and TotalMix
FX it makes not much sense to
do so. At least one can use the
Audio MIDI Setup to check the
available CC modes.
The Audio window in the Audio
MIDI Setup lists four modes: 8,
14, 16 and 20 channels. The
sample rate shown is the one
set in the UCX II.
With 8 and 14 channels chosen up to 192 kHz sample rate can be used. Under iOS 192 kHz is
not possible, as there exists no way to select the second or further
Alternate Setting on the rec-
ord side. iOS and all apps always use the first setting, 20 channels, which limits the sample rate
for record and playback to 96 kHz.
34. Supported Inputs and Outputs
When connected to an iPhone/iPad, the analog mic/line input 1 works with mono apps, inputs 1
and 2 with stereo apps (both dual mono and stereo), and up to 8 inputs with 8-channel applica-
tions like
MultiTrack DAW and Music Studio . Garage Band supports all inputs, but only two at a
time. Auria and Cubasis can record all 20 inputs simultaneously.
Playback will use the rear-side analog outputs 1 and 2, or even more channels if the app sup-
ports such operation. The UCX II can optionally copy the playback channels 1/2 to outputs 7/8,
SPDIF and ADAT 1/2 for easier monitoring (CC Mix:
8-Channel + Phones ). The current routing
can easily be checked and verified with the level meter display. All outputs can be processed
independently (volume, EQ, dynamics, FX return).
Configuring the UCX II is ideally done via the app
TotalMix FX for iPad , otherwise by loading
Setups. These are written into the unit while operated with PC/Mac via TotalMix FX, also storing
control clock mode master or AutoSync and the current sample rate.
Using
RME’s iPad app the Mix modes are automatically disabled as all routing is now controlled
by the app.
The UCX II (and with it the iPhone/iPad) will be synchronized to an external digital sample rate if
there is a valid digital input signal. With a wrong sample rate heavy audio noise will occur. With-
out an AES/SPDIF or ADAT input signal the UCX II enters master mode and uses the sample
rate set by Mac OS X or iOS (the app in use).
While the MIDI I/O will send and receive Sysex messages, not all apps are ready to do this. The
app
Midi Tool Box can be used to verify that the UCX II is working correctly.