As of a couple of days ago, I am the proud owner of a Suzuki M-32C, shipped direct to me from Japan. The intonation is better than I thought, the A-440 key is exact at A-441, most of the other keys are within 10 cents (better than most clarinets or saxophones). I notice, however, in going from ppp–>fff that the pitch goes from flat–> sharp as much as 20 cents…worse for low notes and less for high.
Is this typical? Do you just tune them at nominal volume for some median?
I play woodwinds and keyboards (for decades) so Melodion is a natural for me…also have and play an accordion.