Hi Radiolese, welcome to the forum!
Swan harmonicas used to be of relatively poor quality but were extremely cheap and therefore popular with beginners, though few serious players used them. However, their chromatics have improved a lot in recent years, I played one at the Musikmesse 2017 and was pleasantly surprised. But the reason why so many people prefer the sound of Hohner harmonicas is the superior tone of the brass reeds. No other manufacturer has to date managed to rival the Hohner sound, all other reed materials that I’ve tried have a thinner tone.
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