So how do I "tap and record"?

[elerouxx]

On page 14.5 of the user guide:

"Tap and Record at Same Time
Another flexible feature of a SequencerStaff is the option of tapping your own tempo on the computer
keyboard as you enter notes from a MIDI keyboard. You set up the staff in the same way, but when you start
the recording, you tap an NTempo key on your computer with one hand (to continuously control tempo) as
you play MIDI keyboard keys with your other hand. This way, you can proceed at a comfortable pace until
you start into a difficult passage when you can immediately tap and play extra slowly – or, for passages with
half or whole notes/rests, you can tap and play faster."

I've tried in several ways but I've not been able to use this fantastic feature. What I am missing?

-I tried with or without creating a Ntempo staff filled with quarter notes
-I tried to use this tap and record feature in different staves, sequencer-staff or not

Simply the recording doesn't respond to any tap on the ASDFG row or any other key as the manual says it should, if I understood correctly.