"would love to buy an accordeon, melodeon, concertina, bandoneon, or anything similar. However, I think they are are generally rather loud"

Concerning the bandoneon part... Unless you have big hands and an illogical mind don't! There are parts of a bandoneon that resemble an Anglo but they are limited, you can play in any key BUT where the note will be may bear no relationship to it's neighbours. Also if you get an argentinian (ie tango tuned) bandoneon it will be tuned to A442.

Yes I do play one but I'm also a masochist! It also means that I can no longer play a melodeon or concertina because the fingerings are so totally different.

Steve

PS I have small hands so I only play a four row 126 tone box, the full 144 boxes are fearsome beasties.