Well, the rotation is supposed to be ARM thing, so unless AICA memory controller does exactly the opposite...
I've just watched GB2 intro, music (gunbird2_19.minidsf) plays fine in Makaron and no address is ever unaligned. Yet on AO I get tons of these...

Disregard that statement about AO being too fast. I've just compared it's GB2 output to wave taken from Dreamcast and it's a match. It's Makaron that is slowing down a bit - I guess running SH4 in the same thread does take it's toll.