AudioFile
The audio stimulation is typically controlled via the AudioFile stimulator from Cambridge Research Systems Limited, in which case the sound onset jitter is below 1 ms.
Further technical specifications for the AudioFile are found here.
When using AudioFile
Always check the sound quality and levels before starting the experiment.
Troubleshooting
Sound is distorted
Solution
Restart AudioFile unit by unplugging and re-plugging the USB cable. Try from both the Stimulus PC and from the back of the AudioFile unit.