Reference Guide

1209
Using audio devices in Windows 7
Improving audio performance
To use a custom MMCSS task profile in SONAR
1. Determine the name of the MMCSS task profile that you want to use. MMCSS task profiles are
listed in the Windows registry under
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\Multimedia\SystemProfile\Tasks. Ensure that the registry entry exists for
the profile you want to use.
2. If you have added any new profiles, reboot your computer to allow the MMCSS service to see
the new profiles.
3. In SONAR, go to Edit > Preferences > Audio - Configuration File.
4. Under Configuration Settings, click Edit Config File.
The Aud.ini file opens in the default Windows text editor.
5. In Aud.ini, locate the entry called MMCSSTaskKey and set it to the desired profile name. For
example:
MMCSSTaskKey=Pro Audio
6. Save Aud.ini and close the Windows text editor.
7. Click Reload Config Settings to reload the current audio configuration settings from Aud.ini.
SONAR will now use the new task profile for MMCSS.
WaveRT updates
SONAR supports WaveRT in two ways:
WDM driver mode. WaveRT event mode access is available in SONAR when you are using WDM
as a driver mode and a WaveRT capable audio device is detected. A [WaveRT] suffix is added to the
driver name in this case.
WASAPI driver mode. Event mode WaveRT drivers are automatically listed and available in
WASAPI mode.