User`s guide

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SONAR REAC Recording System User’s Guide
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SONAR audio engine drops out while recording
Some users may have Audio Engine dropouts when attempting to record large numbers of 96 kHz/24-bit
audio tracks, especially when using REAC and the Roland S-4000. Here are some tips to optimize SONAR
for this configuration.
Recording large projects consisting of multiple tracks at high sampling and bit rates can cause CPU or Disk
strain on some PCs. If you experience Audio Engine dropouts (SONAR audio engine and the Now Time
stops) while the transport is rolling or if you see high amounts or spikes in Disk or CPU utilization when
recording projects, implementing one or more of the following tips may help reduce or eliminate Audio Engine
dropouts.
• Make sure SONAR’s Enable Write Caching option disabled. To change the setting, go to Edit
Preferences, click the Advanced radio button and click Sync and Caching, then make sure the Enable
Write Caching check box is cleared.
• Set SONAR’s Playback I/O Buffer Size (KB) and Record I/O Buffer Size (KB) settings to 1024. To
change the setting, go to Edit Preferences, click the Advanced radio button and click Sync and
Caching, then type 1024 in the Playback I/O Buffer Size (KB) and Record I/O Buffer Size (KB) boxes.
•In Aud.ini, you can set RecordPreAllocSeconds=<number of seconds>.
This will pre-allocate the wave files to the desired length prior to recording. Specify the number of seconds
that you expect to record. This reduces disk thrashing and possible audio engine dropouts.
•In Aud.ini you can set ComputePicturesWhilePlaying=0. This helps more if CPU usage is
impacting the Audio Engine.
For information about editing Aud.ini, see the SONAR online Help.
Clicks and pops occur during recording
• If the recorded audio contains pop or clicks, increase the Record Buffer size in the REAC Driver Control
Panel dialog and try recording again.
• Set the buffer size of your monitor device (pages 28–30).
Note: Some systems may not see an improvement with a value of 1024, so leaving it at the default of
512 or trying some other value may be more helpful.