Change quantized loop length while tape is running?

I have dug around but this doesn’t seem possible.

Perhaps one of you has figured out a trick to switch from a 2 bar loop length to a perfectly quantized 1 bar, or 4 bar length while the tape is still running?

Select a track with a prerecorded loop of desired length then hit shift and loop (3).
You can also srcroll green and shift + green ,for end and start points ,but not as quick.


Select a track with a prerecorded loop of desired length then hit shift and loop (3).
You can also srcroll green and shift + green ,for end and start points ,but not as quick.


I love you.