I have been thinking about that and just keep on being puzzled...
- There is a fairly generally accepted opinion that for instance brass reed frames and aluminium ones for english concertinas sound differently but one must bear in mind that they have to be *exactly* them same otherwise to be comapred properly and THAT se hardly ever have. Geoff Crabb has told med that if/when processed properly alike he can't say there is any difference.
- Bandoneons as German concertinas with common reed frames/plates use zinc so there is another factor to consider
- I simply can't understand theoretically how any kind of vibration of the reed plate itself might influence the tone since there can be no audible resonance around.Then i should be by speculative transmission of vibrations from the (common) reed plate influenceingthe swinging pattern of the tongues introducing another kind of overtone pattern than the tongue produces if mounted in a singular frame. Does that make any kind of sense?? I doubt that but it has to be tested laboratory-wise...