User`s guide

User's Guide HDSPe MADIface © RME
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20.3 Supported Sample Rates
RME's Mac OS X driver supports all sampling frequencies provided by the hardware. Besides
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. Select Audio devices under Properties of:
and choose the Hammerfall DSP. A click on Format will list the supported sample frequencies.
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 Settings dialog (System Clock). Format
thus allows you to activate any sampling frequency quickly and easily.
20.4 Channel Count under CoreAudio
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 CoreAudio 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 Double Speed Quad Speed
MADI (1 to 16) MADI (1 to 16) MADI (1 to 16)
MADI (17 to 32) MADI (17 to 32) MADI (17 to 32)
MADI (33 to 64) MADI (33 to 64) MADI (33 to 64)
20.5 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.
20.6 Various Information
The driver requires 10.4.8 or higher. Older versions of OS X are not and will not be supported.
A PPC version of the driver is not available.
Via >System Preferences/ Audio-MIDI Setup< the hardware can be configured for the system
wide usage. Programs that don't support card or channel selection will use the device selected
as Standard-Input and Standard-Output. (Soundstudio, Mplayer, Amplitube etc.).
In the lower part of the window, the audio hardware's capabilities are shown and can be
changed in some cases. On the record side no changes are possible. Programs that don't sup-
port channel selection will always use channels 1/2, the first stereo pair. To access other inputs
use the following workaround with TotalMix: route the desired input signal to output channels
1/2. Hold the Ctrl key down and click on the labels 1 and 2 in the third row. Their labels turn red,
the internal loop mode is active. Result: the desired input signal is now available at input chan-
nel 1/2, without further delay/latency.