Unfortunately the music can't be replaced or removed. At least, not within the Special Actions.
I'm going to try peeking at the actual Subaction code to see if a call to the module, an external subroutine or sound effect call is in there.
If all else fails, I'll create brand new subactions just for his Final Smash and try that.
I'm about to go to choir practice, which reminds me of something. I'm going to make my progress on K. Rool and other PSAs a little bit slower and make my presence here a little more scarce. I'm not retiring. I promised I wouldn't. I'm just going to distance myself slightly from Brawl modding to focus a bit on my singing. I'm serious about this vocation and want to make a living out of it. I'm a classical-crossover singer in training, and unlike my PSAs, I've never had any negative critiques about that when I perform. Maybe I'll post a little something in the Off-Topic board in the future.
I know the idea seems crazy and utterly far-fetched. But I've never been this serious about a career choice in my life, and I strongly believe in it. I have almost universal support from my family and close friends, but actually getting into the business is going to be the hard part. But! Even if I do make it a step further, I won't forget you guys.
I'll keep making movesets here and there, including if Smash for 3DS and Wii U can be modded in a similar fashion to Brawl.
And the thing is, now even I realize I can't PSA forever or be around forever. I have important decisions to make in my life. I'll still be around. Just a little bit less.
Thanks for reading, and I hope you understand.