RME Audio Advanced Remote Control Guia do Utilizador Página 32

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User's Guide Fireface UCX © RME
15. Mac OS X FAQ
15.1 MIDI doesn't work
In some cases the applications do not show the MIDI port. The reason for this is usually visible
within the Audio MIDI Setup – MIDI Window. It displays no RME MIDI device, or the device is
greyed out and therefore inactive. Mostly, removing the greyed out device and searching for
MIDI devices again will solve the problem.
The Fireface is MIDI class compliant. Therefore it comes without a driver. OS X recognizes it as
MIDI device and will be using it with the driver included in the operating system.
15.2 Repairing Disk Permissions
Repairing permission can solve problems with the installation process - plus many others. To do
this, launch Disk Utility located in Utilities. Select your system drive in the drive/volume list to
the left. The First Aid tab to the right now allows you to check and repair disk permissions.
15.3 Supported Sample Rates
RME's Mac OS X driver supports all sampling frequencies provided by the hardware. This in-
cludes 32 kHz and 64 kHz, and even 128 kHz, 176.4 kHz and 192 kHz.
But not any software will support all the hardware's sample rates. The hardware's capabilities
can easily be verified in the Audio MIDI Setup – Audio Window. Select the Fireface UCX. A
click on Format will list the supported sample frequencies.
15.4 Channel Count under Core Audio
At a sample rate of 88.2 or 96 kHz, the ADAT optical input and output operates in S/MUX mode,
so the number of available channels is reduced from 8 to 4.
At a sample rate of 176.4 and 192 kHz, the ADAT optical input and output operates in S/MUX4
mode, so the number of available channels is limited to 2.
It is not possible to change the number of Core Audio devices without a reboot of the computer.
Therefore whenever the Fireface changes into Double Speed (88.2/96 kHz) or Quad Speed
mode (176.4/192 kHz) all devices stay present, but become partly inactive.
Single Speed Double Speed Quad Speed
Analog 1 to 8 Analog 1 to 8 Analog 1 to 8
SPDIF coax L / R SPDIF L / R SPDIF L / R
SPDIF opt LR / ADAT 1/2 SPDIF opt LR / ADAT 1/2 SPDIF opt LR / ADAT 1/2
ADAT 3 to 8 ADAT 3 to 4 -
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