RME Audio Digiface AES, User Manual

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User's Guide Digiface AES
© RME
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In practice, SyncCheck provides the user with an easy way of checking whether all digital devices
connected to the system are properly configured. With SyncCheck, finally anyone can master this
common source of error, previously one of the most complex issues in the digital studio world.
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 . 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 Digiface
’ MIDI is 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 . Select Audio devices under Properties of: and
choose the Digiface. 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 outputs operate in S/MUX mode,
so the number of available channels per port 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 channels without a reboot of the computer.
Therefore whenever the Digiface changes into Double Speed (88.2/96 kHz) or Quad Speed mode
(176.4/192 kHz) all channels stay present, but become partly inactive.