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Pops and clicks with low buffer settings at high sample rates
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When recording or playing back audio with low buffer settings (e.g. 64 samples, 128 samples) at high sample rates (88.2k and up), some systems may experience pops and clicks.  Variables such as CPU speed, track count, and various system settings can affect the overall performance with these settings.  If you experience pops and clicks with higher sample rates at low buffer settings you can raise the buffer size, or optimize your system to improve performance.

These Optimization and Troubleshooting Guides are for Pro Tools, but provide suggestions applicable to any recording application: