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The Multimedia Class Scheduler Service (MMCSS) provides Windows multimedia programs, including SONAR, with prioritized access to CPU resources for time-sensitive processing.
By default, SONAR uses the MMCSS task profile named Pro Audio. If desired, you can instruct SONAR to use a custom MMCSS task profile.
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.
In SONAR, go to Edit > Preferences > Audio - Configuration File.
Under Configuration Settings, click Edit Config File.
The Aud.ini file opens in the default Windows text editor.
In Aud.ini, locate the entry called MMCSSTaskKey and set it to the desired profile name. For example:
Save Aud.ini and close the Windows text editor.
Click Reload Config Settings to reload the current audio configuration settings from Aud.ini.

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