Anything apart from the two mainstream default harmonicas (Solo-tuned fully-valved chromatic, and un-valved Richter 10-hole diatonic). Alternate tunings, different construction, new functionality, interesting old designs, wishful-thinking... whatever!
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I need to re-tune some high/short welded phosphor-bronze reeds upwards by two semitones. How best to do this? I wish to avoid replacing reeds if possible.