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This will be a rather long post, but I hope it won't scare any of you off:) I'm asking this questions hoping that one of you, concertina builders, could give me some general advices and directions on making my own instrument... I don't expect you to share "secrets of the trade" with me - I'm hoping for general "been there, done that, it does/doesn't work" answers and some general knowlege. I've read what I could find on this forum (and on Bob Tedrow site) on concertina building, but I'm still wondering on a few things.. The basic goal of this project is to build a Hayden duet with a range of a typical button accordion, as my desired repertoire consist mostly of conterporary accordion, klezmer, balkan and rock music. I now own an Elise, which being a great entry-level instrument has reached its limits and purchasing larger instrument is not an option because of two main reasons: first - range of available instruments (even Wakker H-2, Tedrow layout, and discussed elswere on this forum hypothetical Morse maximum layout do not fit my needs). And second - prices which, as reasonable as they are, are sadly far from reach for central european wages... I have a quite large set of DIY skills, including metal machining (from stop-motion animation armature making) and both large and small scale woodworking. As for the project itself - as I see it, it will be a hybrid instrument, with reeds scrapped from russian button accordion. I plan on building reedpan and action board first (with a final quality) and put it into a mocked up, prototype but playable case and then build final instrument gradually around it. It will have a normal single reed per note, riveted action aluminum buttons (same as in the modification of the Elise I own) with brass levers, will probably be square (to be as small as possible) and with leather bellows (in its final form - for the protype phase I plan on modifying an accordion bellows). Now, finally for specific questions: a) I wish to obtain as mellow, concertina like, sound as possible with accordion reeds. I have made some experiments to understand how different materials and fretwork pattern/fretless design affect sound. As for other factors to consider in modifying sound, can any of you make a sorted list of them, in order from the most influential to the least? (Except for proper concertina reeds of course:)) As far as I can see, the hybrid reed chambers of modern concertinas are mostly the size of a reed shoe and "cubical" in shape. But accordion reed blocks are trapezoid in shape and often have inserts in them to further change the volume and shape of the reed chamber. Can someone explain to me how these differences affect sound and reed response (in general - again, I don't expect you to give me equations, rather answers what makes reeds slower/faster to speak and sound more mellow/bright) c) I know that using reedpan or reedblocks affect the sound considerably. Is it because of the airflow direction (straight vs "cornered") or sound reflection inside of the a reed chamber? As far as I know, reed instruments don't base on resonant qualities of wood - does a single reedpan affect the sound on any other basis than airflow direction/number of sound bounces in reed chamber (e.g thickness and mass of woodblock etc)? c') As I can see on the only available picture, accordeaphone had a mix of reedpan and an accordion style reedblocks. Have any of you tried "layering" reedpans? It's a little hard to explain what I mean, but what I have in mind would allow overlaying reeds by as much as half of the lenght of the reed shoe and fit reeds in smaller box at a cost of thicker concertina ends (same as when using accordion-style reedblocks). Would such layered reedpan retain the concertina characteristic of sound? ( for some reeds air would have to travel twice as far between reed and valve/lever) d) Does method of mounting reeds to the reed pan affect sound? I'm asking whether wax, wedge mount or L-screw have different stiffnes thus afecting sound in any significant way? If you could spare a moment and answer some of those questions I would be thankfull. PS.: please forgive me any mistakes, english is not my native language...