Audio Power DSP System Multiface 用户手册

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User's Guide HDSP System Multiface II
 © RME
25
 
12.4 Multi-client Operation 
 
RME audio interfaces support multi-client operation. This means several programs can be used 
at the same time. Also all formats, like ASIO, WDM and GSIF can be used simultaneously. The 
use of multi-client operation requires to follow two simple rules: 
 
•  Multi-client operation requires identical sample rates! 
 
I.e. it is not possible to use one software with 44.1 kHz and the other with 48 kHz. 
 
•  Different software can not use the same channels at the same time. 
 
If for example Cubase uses channels 1/2, this playback pair can't be used in Gigasam-
pler/Studio (GSIF) nor under WDM (WaveLab etc.) anymore. This is no limitation at all, because 
TotalMix allows any output routing, and with this a playback of multiple software on the same 
hardware outputs. Note that the inputs can be used at the same time, as the driver sends the 
data to all applications simultaneously. 
 
ASIO Multi-client 
RME audio interfaces support ASIO multi-client operation. It is possible to use more than one 
ASIO software at the same time. Again the sample rate has to be identical, and each software 
has to use its own playback channels. Once again the same inputs can be used simultaneously. 
 
RME's sophisticated tool DIGICheck is an exception to this rule. It operates like an ASIO host, 
using a special technique to access playback channels already occupied. Therefore DIGICheck 
is able to analyse and display playback data from any software, no matter which format the 
software uses. 
 
Multi-Client and Multi-Channel using WDM 
The WDM streaming devices of our driver can operate as usual stereo devices, or as 8-channel 
devices. The option Interleaved in the Settings dialog determines the current mode. 
 
Interleaved not active: The WDM devices operate as usual stereo devices. The multi-client op-
eration works as described above with WDM, ASIO and GSIF. 
 
Interleaved active: The WDM devices can also be used as 8-channel devices. Unfortunately the 
Kernel Mixer, active with any WDM playback, then always occupies and blocks 8 channels at 
once, even when WaveLab or the Media Player perform just a stereo playback (2 channels). 
So: 
 
If any stereo pair within an 8-channel group is used, the whole 8-channel group is blocked. 
As a result, no second stereo pair of this group can be used, neither with ASIO nor GSIF. 
 
The eight 8-channel groups are: channels 1 to 8 and 9 to 16. 
  
Starting ASIO or GSIF playback on any of the stereo pairs of an 8-channel group prior to start-
ing a WDM playback will prevent the Kernel Mixer from opening the 8-channel device, as two of 
its channels are already in use. The Kernel Mixer then automatically reverts to open a stereo 
device for a stereo playback.