Echo=On

[Sandy]

In a Track container there is button next to the record button with concentric arcs as icon. On hover It says Echo = On. 
What is that button for ?
When I play a track from Cakewalk thru my audio interface the playback sound only comes when I select this button to 'On"
Does one have to keep this button always 'On" to listen to the tracks in the DAW ?

Edited January 20, 2022 by Sandy

[scook]

Echo plays the data coming into the track.

If there are clips in the track, echo is not necessary to hear the clips.