Porting custom characters over to different slots?

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Hey, I was wondering if there's any easy way to port a custom character over to a different slot? I know I can rename all the .pac's and .pcs' to the character I want, but I also want to port over the .sawnd file. Is it possile? Also I dont even think that works 100%... Some stuff is still broken and he sometimes freezes in place. What should I be doing differently?