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To edit Aud.ini, do the following:
1.
Go to Edit > Preferences > Audio - Configuration File.
2.
Under Configuration Settings, click Edit Config File.
The Aud.ini file opens in the default Windows text editor.
3.
Edit Aud.ini as desired.
4.
Save Aud.ini and close the Windows text editor.
5.
Click Reload Config Settings to reload the current audio configuration settings from Aud.ini.
Table 91. AUD.ini 
This variable goes in the [PluginUpsampler] section, and specifies whether resampling is applied. It corresponds to the Upsample on Render and Upsample on Playback settings in SONAR’s UI. Valid values are as follows:
This is a line in the Wave section of the Aud.ini file that sets the buffer size for bouncing tracks. At a value of 0, the bounce buffer is the same size as the Mixing Latency value that you set in Edit > Preferences > Audio - Driver Settings. If you find that bouncing tracks, especially with certain soft synths, takes a very long time, you can set this value to 100, or some value between 0 and 350 so that the bounce buffer will use a more efficient size for bouncing, which has different requirements from normal playback latency.
Note: on larger projects, setting this variable to a large value can cause out-of-memory errors.
The DefaultEqPosition Aud.ini variable lets you specify the default EQ position for all new tracks/buses. This variable lives in the [Aud] section of Aud.ini, and legal values are: 0 (pre FX) or 1 (post FX).
Note: It is not recommended to set the online method to the expensive types since it may cause glitches.
The audio engine will now render a smooth fade in whenever audio playback is interrupted and there is an abrupt transition in gain. The purpose of doing this is to dezipper (smooth out) the gain transition due to the discontinuity. For example, if you click on the Time Ruler to jump to a new time location during playback, the engine will smoothly render the transition to the new gain level as a fade in. This smoothing also takes place whenever playback gapping occurs. You can control the fade in time via the GapDezipperUsec variable, which is expressed in microseconds per dB and controls the speed of the fade in to the new gain value. (default = 500 microseconds. i.e. the fade will take 500 microseconds per change in dB at the transition point). You may increase or shorten the time of the fade by increasing or decreasing this value. The normal legal value range for this variable is 0 to 1000 microseconds.
This variable should be set in the [Wave] section. A value of zero turns off dezippering on gapping completely.
This variable goes in the [Wave] section, and specifies the max preview duration (in milliseconds) in the Media Browser.
Note: although SONAR doesn’t enforce a fixed value range, the recommended range should be between 10 and 200 milliseconds.
This is a line in the Wave section of the Aud.ini file that controls whether or not audio devices are reset in response to transport changes (play/stop).
This variable is similar to GapDezipperUsec except that it controls how the mixer itself renders abrupt gain transitions due to envelopes in the project. This variable is expressed in microseconds per dB and controls the speed of the fade in to the new gain value (default = 50 microseconds). The normal legal value range for this variable is 0 to 1000 microseconds.
This variable should be set in the [Wave] section. Important: Changing the value of this variable will affect how envelopes are rendered by the mixer and may cause your mixes to sound slightly different. Setting MixDezipperUsec too low can cause clicks while rendering abrupt gain changes due to envelopes.
By default, SONAR uses the MMCSS task profile named Pro Audio. If desired, you can instruct SONAR to use a custom MMCSS task profile.
If you have existing projects that use a non-default pan law (i.e. other than 0dB center sin/cos taper), the mix might sound louder in SONAR Artist/Steam Edition/Professional/Platinum.
This is a line in the Wave section of the Aud.ini file that specifies whether SONAR uses multichannel audio devices as multiple stereo pairs or just a single stereo pair.
This is a line in the Wave section of the Aud.ini file that specifies whether SONAR uses multichannel audio devices as multiple stereo pairs or just a single stereo pair.
This is a line in the [Wave] section of the Aud.ini file that controls whether VST plug-ins are suspended and resumed prior to starting a bounce operation.
This variable goes in the [Wave] section and controls the interaction of the main audio thread and worker threads on multiprocessor systems when the Use Multiprocessing Engine option is enabled. Depending on the system, a particular model may result in less glitching and better overall performance. The values are as follows:
This line goes in the section of the Aud.ini file under [name of your sound card (‘n’ in , ‘n’ out) ]. If you get an error message when you try to change the audio driver bit depth to 24, try setting this line to 1. Most USB audio devices that use WDM drivers need this line set to 1.
This variable goes in the [Video] section, and specifies the default video engine. For example:
Note: Setting the value to 2 might have an adverse effect with certain audio hardware, causing recording to drop out. If this occurs, reset the value to 8 and try using ASIO drivers if your hardware has ASIO support.
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