RME Audio Digiface Ravenna, User Manual

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28 User's Guide Digiface Ravenna
© RME
14.3 Channel Count under Core Audio
In Single Speed Speed (44.1 and 48 kHz) 128 input and output channels each are available.
Double Speed (88.2 and 96kHz) reduces the number of available channels to 64 each. Quad
Speed (176.4 and 192kHz) reduces the number of available channels to 32 each.
It is not possible to change the number of Core Audio devices without a reboot of the computer.
So when the Digiface Ravenna changes to Double Speed (88.2/96 kHz) or Quad Speed mode
(176.4/192 kHz) all channels stay present, but are partly inactive.
14.4 Various Information
The driver of the Digiface Ravenna requires at least macOS 11.
Programs that don't support card or channel selection will use the device chosen as
Input and
Output in the System Preferences
– Sound
panel.
Via
Launchpad
– Other – Audio MIDI Setup
the MADIface can be configured for the system
wide usage in more detail.
Programs that don't support 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. In the channel settings of outputs 1/2 activate
Loopback . Result: the de-
sired input signal is now available at input channel 1/2, without further delay/latency.
Use
Configure Speakers to freely configure the stereo or multichannel playback to any available
channels.
15. Using more than one Interface
OS X supports the usage of more than one audio device within the audio software. This is done
via the Core Audio function
Aggregate Devices , which allows to combine several devices into
one. This function is found in the Audio MIDI Setup
– Audio Window
. Click the + sign in the
lower left.
The current driver supports up to three RME USB devices of the MADIface series. All units have
to be in sync, i.e. have to receive valid sync information (by feeding synchronized signals).

If the Digiface Ravenna is set to clock mode Master (Internal), all others have to be set to
clock mode Slave, and have to be synced from the master. The clock modes of all units have
to be set up correctly in the MADIface Settings dialog.

If all units are fed with a synchronous clock, i.e. all units show Sync in their Settings dialog,
all channels can be used at once.
Note: TotalMix is part of the hardware of each unit. Up to three mixers are available, but these
are separated and can't interchange data. Therefore a global mixer for all units is not possible.