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User’s Guide HDSP System Multiface © RME

8.4 Low Latency under MME (Buffer Size Adjustment)

Using Windows 95 or 98 the MME buffer size was nothing to worry about. Latencies below 46

ms were not possible. Meanwhile both computers and operating system have become much

more powerful, and since Windows ME/2000/XP latencies far lower can be used. SAWStudio

and Sonar allowed to use such low settings from the start. Sequoia was updated in version

5.91, WaveLab in version 3.04.

In the HDSP's Settings dialog the MME buffersize (in fact the DMA buffer size) is set with the

same buttons as the ASIO buffer size. Our test computers allow to use settings down to 64

samples without clicks. Please note that this setting only defines the buffer size of the

hardware. The true and effective latency is configured within the MME application!

Attention: the DMA buffers must not be larger than the application's buffers. This case can

happen unnoticed when using ASIO and MME at the same time (multi-client) and setting

ASIO to 186 ms, while the buffers in the MME application are still set for a lower latency.

Playback will be stuttering and audio will be distorted.

Example: when you set the Hammerfall to 512 you can't use 128 in any program. But setting

DMA to 128 allows to use 128 and all higher values within the software.

Please also note that this is a 'you're welcome to try' feature. We can't guarantee that you will

be able to use 3 or 6 ms with MME. Simply check out by yourself which lowest setting your

system and software allows. Some motherboards with insufficient PCI bandwidth (especially

VIA based) suffer from crackling at settings below 512. Be sure to set the buffer size to 512 or

higher in such a case.

8.5 Multi-Client Operation

RME audio cards support multi-client operation. This means several programs can be used at

the same time. Also all formats, like ASIO, MME 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!

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 (default in Cubase, Master bus), this playback pair

can't be used in Gigasampler/Studio (GSIF) nor under MME (WaveLab etc) anymore (the

inputs can be used at the same time). 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.

ASIO Multi-client

RME audio cards 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. The inputs can be used simultaneously.

An exception is our sophisticated tool DIGICheck. It operates like an ASIO host, using a special

technique to access playback channels already occupied. Therefore DIGICheck is able to

perform an analyzis and display of playback data from any software, no matter which format

the software uses.

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RME Audio Multiface Guide de l'utilisateur Page 13