TLDR: Its loop pedal effect that we are talking about.
Guyz have been pulling my hairs for quiet a while, just cant figure out what this effect is called or what term should I use to Google, for any plugins for flstudio or similar to get this effect. I have exhausted all my imaginations by searching "revervbation","reverbating echo", "continious echo loop"...
Effect: The continuous echo this guy is creating.
PS: I know that he is using a dedicated hardware for it, but I am quiet sure there exists a software for the similar effect.