Tona > Thanks a lot! It sounds great! There aren't many players who try to tackle the musette genre on the concertina.
ceemonster > Yes of course, there's the technical aspect as well. That's also what makes Jody's arrangement interesting.
Yes, the Um-pa or Um-pa-Pa template is very powerful. Used with discretion, it can move the music on with a nice rhythm that also contains the harmonic foundation. In this arrangement I've tried to adhere as much as possible to the composer's intent, so Um-pa or Low-High phrases figure throughout in the accompaniment.
I got it... that this is an Anglo and duet technique, but there's no reason, aside from added complexity, that the EC can't do it too.