Bonjour et bienvenu Joseph, it’s great to have a person like you in the forum!
I have a few questions:
Like most of us I come from a keyed instrument (which in my case is the piano accordion), and I think that only few melodica players are able to play button system (or it would take a huge effort to really learn it). Did you ever think of building a keyed accordina? I’m sure this would get you many new buyers because apart from the vintage claviettas there exists no key accordina! And the sound of the accordina is so special that it can’t be compared to any other melodica.
Or (that was a point of discussion here at another forum) would it be possible to build an accordina with Janko-System (or Beyreuther or 6:6, there exist different names)? But this melodica would have to be bigger to guarantee a similar range, and perhaps that would be a problem…
Some accordinas have a possibility to create a WahWah-effect. Does yours have that possibility, too?
That’s all for the moment. I’m looking forward to your answers.