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Co-authored-by: ronso0 <ronso0@mixxx.org>
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daschuer and ronso0 authored May 8, 2021
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In regular intervals, we discuss how much latency the [JACK Audio Connection Kit](https://jackaudio.org) introduces when used in Mixxx. That is one of the [Sound APIs](https://manual.mixxx.org/2.3/en/chapters/preferences.html#sound-api) that Mixxx supports on Linux, and it's a layer on top of the [Advances Linux Sound Architecture (ALSA)](https://www.alsa-project.org).

Unlike analog devices, digital audio devices process audio in time slices of samples stored in memory buffers. These are passed through the various layers. The latency of a digital audio device depends on the number and size of those buffers.
The aim is to minimize the latency, so that pressing a button or turning a knob in Mixxx works without noticeable delay, which would make DJing by ear impossible.
The aim is to minimize the latency, so that the audible result of pressing a button or turning a knob in Mixxx is produced without noticeable delay, in order to allow DJing by ear.

The [JACK FAQ](https://jackaudio.org/faq/no_extra_latency.html) state that:
> There is **NO** extra latency caused by using JACK for audio input and output. When we say none, we mean absolutely zero.
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