Group editing on lines- listen tool. Operates just on one track (as always used to be).
An option of “listening” the whole mix would be VERY helpful feature 
You are referring to the Scrub/Play tool, I figure…
+1 for multi-track scrubbing up to the whole project, midi and audio!
Exactly. Scrub/Play tool (Indeed, I was not precise…)
“multi-track scrubbing up to the whole project, midi and audio!”. Smelts tasty 