Emulator

Oops. System specs:
Windows 7 SP1 64-bit
Intel i5 760 @ 2.8GHz
nVidia GeForce 560 Ti
6GB RAM

CptnOblivious, just to confirm that you are using the DSP ROM dump from your Wii and not the free one provided with Dolphin?

Correct. To be absolutely sure, I dumped the DSP again and tested. Same issue.

I can confirm this issue. It almost sounds like all of the music is playing back out of pitch. I also noticed that the sound effects during the opening cut-scene got out of sync (almost as if the sound was going maybe 1.5x the video).

The audio files from that first post have been deleted by the file hosting service. Any way to rehost them somewhere?

Delroth, I'm looking for a suitable site for more permanent storage. Until then, please download them from my Dropbox:
https://dl.dropboxusercontent.com/u/31926301/for_delroth.zip

To everyone else, please wait a bit...

I've noticed the music being out of tune with HLE on version 4.0-102 as well. It is really jarring in certain places.

It should be noted that when the port from the Dreamcast to the GameCube was done, all of the music had its quality reduced in some way. So when trying to fix this problem, the Dreamcast reference audio shouldn't be used.

Yes, and no. From what I can tell using that old-as-sin asset ripper on the DC version and comparing to the CG files from within Dolphin, sound effects and the like are all the same. Similarly, and more pertaining to this thread, the game's music system was poorly ported to the Gamecube in that the instruments are essentially the same, but the implementation allows for sound effects to interrupt whatever channels the midi tracks play on. In Dolphin, this problem is far lessened compared to the actual hardware, though you'd have to ask the kind doing-this-in-their-spare-time coders as to why. This is why I offer the Dreamcast audio as a comparison. It's probably possible to, through emulation, run the game fast enough (or hack around it like badkids) to eliminate the game's music /playback/ issues.

The instruments being out of pitch, though, that's all on Dolphin here.