Somewhere, and some few weeks ago, I read official Suzuki information (user guide, web brochure, or website; I can’t remember exactly) that stated the A-34C was designed to produce a different tonality (lower, mellower, softer?) as it was intended for ensemble playing. I assume this was to create a gentler, more harmonious sound when 8 to 10 melodions are playing at the same time.
I notice a very subtle difference between the A-34C and the M-32C, and can’t imagine it would make a difference in an ensemble. However, I have not experimented enough yet. More to come after I do a closer comparison.