Both Iphone and android have free tap tempo apps. Search "tap tempo" or "Bpm".
So there is a quick way to judge the tempo
To sync time with a live beat, go to "reset loop timeing" on your tenori, and start tapping the tempo on the "OK" button....it will ask if you want to reset the timeing...dont read it ...just keep tapping...dont try to time the loop point..just keep tapping...you will hear the timeing match once you tap in time correctly...then stop tapping at the loop point
..if the tempo is not in time....start tapping again
I use my tenori with turntables, and this method works great.

I do think tap tempo needs to get added to the tenori. I wanted to share the method of tapping the "reset loop timeing" to sync time.
Even if Tap tempo is added, syncing live will still be a necessary task..and I think the method described above is how to do it

OK better method

L4 + R1 reset the loop timing, with no need to go into the menu
Hold down L4 and start tapping R1
resets timing on every tap

Tap tempo is one of the most surprising missing features,
I really hope they add it soon - shouldn't be TOO hard, right?