When doing the Rocket Reinforcement exercises there are keystrokes (1,2,3) to indicate Easy, Good and Hard, but is there a single keystroke to record one's voice, or is the only way to use the mouse to click the red record button?

It has always been "r" as far as I have been aware of.

Right thanks for that Tony, I hadn't been aware of it.
Just tried it & it works fine.