<p>
Processing latency is usually divided into <dfn>capture latency</dfn> (the time
it takes for the digitized audio to be available for digital processing, usually
- one audio period), and <dfn>playback latency</dfn> (the time it takes for
+ one audio period), and <dfn>playback latency</dfn> (the time it takes for the
+ audio that has been processed to be available in digital form).
In practice, the combination of both matters. It is called <dfn>round-trip
latency</dfn>: the time necessary for a certain audio event to be captured,
processed and played back.
<li>Make the appropriate connections between the jack ports so the loop is closed.</li>
<li>Adjust the playback and capture levels in the mixer.</li>
</ol>
+<p class="warning">
+ On Linux, the latency of USB audio interfaces is not constant. It may
+ change when the interface is reconnected, on reboot and even when xruns
+ occur. This is due the buffer handling in the Linux USB stack. As a
+ workaround, it is possible to recalibrate the latency at the start of each
+ session and each time an xrun occurs.
+</p>