The MINI M2 seems to work fine:

https://www.eventideaudio.com/community/forum/stompboxes/morley-m2-mini-expression-pedal

So the M2 is probably fine, too.

Though there are plenty of more proven-compatable EXP pedals- if you wanted something less… gigantic 🙂

I got the reply from Morley:

You’re right anyway, I should keep my eyes open for the case I find something even better.

the bloomery looks cute for instance.

Thanks a lot, Tom. Now that I have a starting point, I’ll spend some time testing and taming this week-end. I’ll be back for some feedback.