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

15. Mac OS X FAQ

15.1 MIDI doesn't work

In some cases MIDI does not work after the installation of the HDSPe driver. 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 HDSPe MIDI driver is a plugin. During installation it will be copied to Library / Audio / MIDI
Drivers. It's name is HDSP MADI MIDI.plugin. The file can be displayed in the Finder and also
be removed by simply dragging it to the trash bin.

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. Besides
192 kHz and 96 kHz this also includes 32 kHz and 64 kHz.
But not every 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 HDSPe AIO Pro. A
click on Format will list the supported sample rates.
If the unit is in clock mode Master, selecting a sample rate will immediately set the device to this
frequency, which can be verified in the HDSPe's Settings dialog (System Clock). Format thus
allows you to activate any sampling frequency quickly and easily.

15.4 Channel Count under CoreAudio

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 CoreAudio devices without a reboot of the computer.
Therefore whenever the AIO Pro changes into Double Speed (88.2/96 kHz) or Quad Speed
mode (176.4/192 kHz) all devices stay present, but become partly inactive.
Core Audio
AIO Analog 1/2
AIO Phones L / R*
AIO AES L / R
AIO SPDIF L / R
AIO ADAT 1 bis 2
AIO ADAT 3 bis 4
AIO ADAT 5 bis 8
*The phones output (AIO Phones L / R) is only available as output.
30
Double Speed
AIO Analog 1/2
AIO Phones L / R*
AIO AES L / R
AIO SPDIF L / R
AIO ADAT 1 bis 2
AIO ADAT 3 bis 4
AIO ADAT 5 bis 8
User's Guide HDSPe AIO Pro © RME
Quad Speed
AIO Analog 1/2
AIO Phones L / R*
AIO AES L / R
AIO SPDIF L / R
AIO ADAT 1 bis 2
AIO ADAT 3 bis 4
AIO ADAT 5 bis 8