Mac Os X Faq; Midi Doesn't Work; Repairing Disk Permissions; Supported Sample Rates - RME Audio MADIface USB User Manual

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 MADIface USB MIDI is class compliant. Therefore it comes without a driver. OS X recog-
nizes 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 MADIface USB. A
click on Format will show the full list of supported sample rates.

15.4 Channel Count under Core Audio

The MADIface allows the use of sample rates up to 192 kHz via the MADI interface. For this to
work single-channel data is spread to two or four channels using the Sample Multiplexing tech-
nique. Therefore the number of channels is reduced to 32 or 16 respectively.
It is not possible to change the number of Core Audio devices without a reboot of the computer.
So when the MADIface changes to Double Speed (88.2/96 kHz) or Quad Speed mode
(176.4/192 kHz) all channels stay present, but are partly inactive.
Core Audio
MADI (1 to 16)
MADI (17 to 32)
MADI (33 to 64)
Note: If an AES signal is applied to the BNC input, and Coaxial is selected as Input, the AES
audio signal will appear on channels 1/2 in TotalMix FX and the recording software. Channels 3
to 64 then carry no audio data.
Double Speed
MADI (1 to 16)
MADI (17 to 32)
MADI (33 to 64)
User's Guide MADIface USB © RME
Quad Speed
MADI (1 to 16)
MADI (17 to 32)
MADI (33 to 64)
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