Tell them that I closely monitor this thread and all their requests and complaints are heard.
For the people with bad sound/music in x360, how is the distortion exactly? which setup do they have? (optical, hdmi, AV receiver?) does lowering the music volume improves the sound quality?. I hope it's not related to the disk streaming latency issue. If possible, try running the game from a USB flash drive to see if there is a difference.
Regarding sound quality, we are using the original masters, as they were done, with the maximum quality, so they sound exactly as intended by the composers (stereo separation and such). Professor K and radio speech also come from the original masters, but they were already saturated there, so there is little we can do. Game sounds are played using the original game compressed banks, so they sound worse (compressed, a bit distorted, it's ADPCM).
We are aware of some slowdowns,mainly in bantam street, on the top of the building, it's likely caused by the amount of shadows this level have. If they check the DC version, it's the only level where shadows pop in very close to the player, they were probably disabled in the original version when far from player because of the slowdown, but now we are running with a very much larger view distance, and shadows, in the way the dreamcast used them (and we have to use them that way), eat a lot of fillrate in current video cards.