A Nord Electro secret hidden in plain sight...

[offrhodes]

... is the "tap tempo" button in the delay effect.
If you ever need to count in a song and are unsure of the tempo, here's the absolute reference: It shows the tapped tempo on the display.
No more excuses for starting too slow

[venro]

Wow thanks for this marvel. You can also just dial in the bpm by turning the knob and save it on an unused part.

[keysmcgee]

Never thought of using it this way. That's a great idea; thanks!