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By magic square standards Soundwave might as well not even have an ab joint desu.
I see why though, it's one of those transformations where there's an upper body swivel and lower waist swivel because the middle section of the torso has to rotate to swing the panel with the real tapedeck buttons to the front. I guess that didn't really leave them enough room to cram a bigger hinge for the ab joint around the lower swivel in there.
Still, when it can move so little, why even bother in the first place? If NA's Soundwave manages to have any good ab articulation that might be one clear advantage over the MS Soundwave.