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20.4 Various Information
The current driver requires 10.5 or higher. Older versions of OS X are not 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.
The playback can be configured freely and to any of the available playback channels via
Speaker Setup. Even multichannel playback (Surround, DVD Player) can be set up easily.
OS X supports more than one audio device. Since 10.4 (Tiger) Core Audio offers the function
Aggregate Devices, which allows to combine several devices into one, so that a multi-device
operation is now possible with any software.
The Hammerfall DSP driver adds a number to each unit, so they are fully accessible in any
multicard-capable software.
20.5 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 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 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 HDSP's settings dialog (System Clock). Format thus
allows you to activate any sampling frequency quickly and easily.
20.6 Channel Count under Core Audio
The HDSPe system's ADAT optical interfaces allow to record sample rates of up to 192 kHz
using a standard ADAT recorder. For this to work single-channel data is spread to two or four
ADAT channels using the Sample Multiplexing technique. This reduces the number of available
ADAT channels from 8 to 4 or 2 per ADAT port.
It is not possible to change the number of Core Audio devices without a reboot of the computer.
Therefore whenever the RayDAT changes into Double Speed (88.2/96 kHz) or Quad Speed
mode (176.4/192 kHz) all devices stay present, but are partly inactive.
User's Guide HDSPe RayDAT © RME
36
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