Reference Guide

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Improving Audio Performance
Improving Performance with Digital Audio
simultaneous tracks, and use a smaller number of simultaneous real-time effects, in a 24-bit
project than you would be able to in a 16-bit project. This is also true when working at higher
sampling rates (i.e., a 24-bit/96khz project requires substantially more computing resources than
a corresponding 16-bit/44.1khz project). Depending on the size of your project and the
configuration of your computer (CPU, RAM, disk), you may need to reconsider whether working at
the higher bit-depth/sampling rate is justified or even possible.
Some plug-ins do not function well at a 96 kHz sampling rate.
Using an audio bit depth of 24 can enhance the performance of some plug-ins, but raising the
sampling rate to 96 kHz does not offer much improvement, and can cause some plug-ins to add
unintended artifacts to the sound. Using a 24-bit, 44.1 kHz setup for your audio provides plenty of
enhanced performance for plug-ins that can take advantage of it, without risking the problems that
96 kHz audio causes with some plug-ins.
It’s also worth noting that not all audio projects benefit equally from the use of higher bit-depth/
sampling rates. Most professional sound engineers will tell you that 24-bit, higher-sampling-rate
audio is most beneficial when working with music that focuses on natural acoustic instruments and/
or vocals recorded with very high-quality microphones. The benefits of 24-bit/high-sampling-rate
recording are less audible when working with highly synthetic or highly compressed program
material, often found in contemporary popular music. You must make your own judgement about
whether the benefits of higher-capacity audio justify the extra demands it places on your computer.
Dropouts and Other Audio Problems
If your SONAR application suddenly stops producing audio while in the midst of recording or
playback, you've very likely experienced a "dropout." Sometimes instead of a dropout, you may
experience a "stutter" during playback (a small section of audio repeats itself once or twice before
normal playback resumes). Or, you may occasionally experience a "glitch" or "pop" during audio
playback (a brief interruption or clicking noise is heard, but audio playback then continues normally
from that point). It is possible to experience a dropout while working exclusively with MIDI (i.e., no
audio data in the project), but this is a different matter and is not covered here.
All of these audio problems are the result of audio information not being sent to or received from
your sound card fast enough or reliably enough. During recording, the sound card sends incoming
audio data to the sound card driver, which in turn sends audio data to SONAR to store on hard disk.
When playing back, SONAR reads audio data from the hard disk and feeds it to the sound card
driver, which in turn passes it to the sound card for audible output. If these activities can't be
completed fast enough, or if the communication between SONAR and the sound card driver is
broken in some way, recording and/or playback will be disturbed.
Causes and Cures
The exact cause of your audio problem will vary depending on the configuration of your computer
and/or the content of the project file you're working with. The majority of audio problems are caused
Note: Red Book Audio CDs are still 16-bit (44.1 sampling rate), so if your goal is to burn a CD,
you will have to mix down to 16-bit.