I'm having some trouble getting DSP input levels right. Problem is the sample values in MIXS are well in range but DSP ends up heavily clipping the output anyway... Seems like AO has this too, try listening to soa-367-04-00 with DSP output only and you should hear it hiss and die within seconds.
kingshriek, as I understand AO uses parts of MANATEE to play DSFs? Would it be possible to create some sort of patcher that would go over dumped RAM image and hack ARM program to mask DISDL writes to zero? I'd like to test that soa-367-04-00 (and few other tunes as well) on Dreamcast, but with DSP output only. This way I could confirm if it's supposed to be that way or is it our DSP bug.