[Ask] What is ReClock?

Sorry for double thread-ing. But since this is different topic I think it's better if it's on the different thread.

Anyway, I just want to ask, what exactly is ReClock?
What it's use for and how to configure it?

Thanks

EDIT:
Additional question. Is ReClock same with madVR's Smooth Motion?

It is an audio renderer.
https://forum.slysoft.com/forumdisplay.php?85-ReClock

ReClock can for example be used to adjust playback speed from 25fps to 24fps. It is not the same as smooth motion. That does not change speed.

Hmm, I maybe repeating myself here.
But thanks for the explanation.

Audio renderer can be used for changing playback speed?
I thought playback speed is not only depended on audio so it needs to be done before splitter?
cmiiw

Speed is measured relative to a reference clock, which happens to be controlled by the audio renderer.

Some good info can be found here:
http://wiki.jriver.com/index.php/Video_Playback_Customization