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The ProOne is so lush in its warmth tone and it's overall a bigger, fatter sound at least to my ears. The soprano can be quite a a shrilly instrument especially in the higher registers but the ProOne still maintains that warmth even in the higher notes.. beautiful sounding instrument :)
I can hear the difference between the horn here vs the alto ones. The PowerBell was definitely brighter. The ProOne had more body, IMHO. Both still sounded great. If given the choice and the budget, I'd lean towards the ProOne.
Odd question... do all soprano players play off center? I've been combing the youtubes looking for soprano reviews before I buy and just about all of the soprano players don't have the mouthpiece centered twixt their lips.