I think a real time BPM analyzer would be really cool.
I had a Free the Tone Flight Time delay pedal which has a bpm analyzer/mic built into it. You could set it to adjust the bpm on the fly within a given range.
If the track tempo started to speed up or slow down a bit, it adjusted the delay tempo, keeping things nicely in sync.
This would also be really cool with using the looper block with other live musicians, as your loop could stay in sync with the band, and everyone wouldn’t be a slave to the loop.
Wouldn’t replace a tap tempo function, but very useful not having to keep retapping on tempo changes.
I used to have a hardware bpm to midi sync box a few years ago. You could play a track from an audio source, or input from a live drummer, and have a midi drum machine, effects unit play in time with it. Really cool.
Plus, with a good real-time bpm analyzer you can do easier on the fly looping of a given number of bars, without the need to stat and stop, just hit a button to loop for say 4 measures and keep on playing.
All this might be a bit new for a lot of guitar players, but coming from a dj/synth background it’s really useful stuff and could add a lot of cool new tricks to the Axe