Thank you! These sound files are great! For some reason when I listen to them, they DO fade out nicely - no abrupt endings, so they worked out as you intended. The second one won't play, but the others do.
I had never heard of a Duet until I read your post, and so searched them out online. I found some great sites on their history, etc. I am intrigued! From what I read, however, it is difficult to find an instructor for them. But then again, where I live, I would be lucky to find any instructor for any type of concertina. So I will be mainly self-taught - with the help of books, websites, etc.
I am leaning towards the Jackie on the site you posted. I like that it can be traded in for full price on an upgrade, and the soundbites of it being played on it's site sound good - to my untrained ear at least. The concertinas I like the best so far to listen to are the metal ended English ones. I've only managed to find a few sound files online with them, but they remind me of a French Horn - which I love. It will be awhile though, before I'm ready/able to invest in one of those!