User`s guide

36
User's Guide Fireface 800 © RME
16. Mac OS X FAQ
16.1 MIDI doesn't work
In some cases MIDI does not work after the installation of the Fireface driver. To be precise,
applications do not show an installed 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. If this does not help, we recommend manual removal of the MIDI driver and rein-
stallation of the complete driver. Otherwise repairing permissions may help.
The Fireface MIDI driver is a plugin. During installation it will be copied to >Library/ Audio/
MIDI Drivers<. Its name is Fireface MIDI.plugin. The file can be displayed in the Finder and
also be removed by simply dragging it to the trash bin.
16.2 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.
16.3 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 Fireface. A click on Format will list the supported sample frequencies.
16.4 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.
It is not possible to change the number of Core Audio devices without a reboot of the computer.
Therefore whenever the Fireface 800 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
Fireface Analog 1 bis 8 Fireface Analog 1 bis 8 Fireface Analog 1 bis 8
Fireface SPDIF L / R Fireface SPDIF L / R Fireface SPDIF L / R
Fireface ADAT 1 bis 8 Fireface ADAT 1 bis 8 Fireface ADAT 1 bis 8
Fireface ADAT 9 bis 16 Fireface ADAT 9 bis 16 Fireface ADAT 9 bis 16