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3.5.3.2 Controlling Latency by Changing the Buffer Size
Latency in an audio interface can be defined as the time required to process a sample from an application to the interface’s audio
output. A number of factors determine the achievable latency performance of a Hilo system: Processor speed; Operating system;
Sample rate; Number of utilized record or play channels; System efficiency; etc.
Latency can be manipulated by changing the size of the buffers used to transfer data to and from Hilo. Core Audio buffer size
controls are offered within most pro audio recording applications. With Hilo, buffer sizes typically range between 32 and 2048
samples.
Smaller buffer sizes will give you lower latency. However, if a buffer size is too small for the system or context, audio anomalies such
as clicks and pops may occur. It is recommended to become familiar with altering the Hilo buffer size to best suit the context of use.
Once you determine the lowest achievable buffer size, you will typically have to double the buffer size each time you double the
sample rate, but the effective latency will remain constant. For example, if a system is capable of operating at a buffer size of 128
samples at 48 kHz, then for a 96 kHz project, the buffer size will likely need to be increased to 256 samples, which is exactly the same
latency.
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