Can't believe a newcomer actually had the will to do this. I'm proud.
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http://forums.kc-mm.com/index.php?topic=44121.0Basically reading through this topic (above) helped me a lot. I used Super Sawndz to test and listen to each sound as well as find the correct wav ID, Sawndz 0.12 to insert the .wav files, and I can't remember where, but I found a .zip file online with all of Zelda's voice files. You need the textfile named brawlbox in Jaklub's sawndz folder in order to find the correct Group/Collection IDs for each character .This information will go into sawndz 0.12. Of course you will need Smashbros_sound.brsar -- this goes into the sawndz 0.12 folder. (You will most likely want to back this up... actually, I recommend it.)
Open Super Sawndz and load your Smashbros_sound.brsar. On the right hand side of the program, you will see a list of all of the sound files in the game. Choose the character you'd like to change and you will see the list expand into 2 groups. The top group is for voices and the bottom for sound effects specific for that character.
When you click on a sound, you will notice that the Wave ID changes. That number goes into sawndz in the Wave ID section under Collection ID. The Group and Collection IDs can be found in the brawlbox text file. Once you have the Group, Collection, and Wave IDs...click "Insert". Find the wave file you would like to replace the original file with and that's it. Once everything is done, your .brsar should be updated with the new sounds.
*Side Note* - I did this as an edit to Marth's soundbank to make Mia sound like Zelda. Unfortunately, I forgot Roy (under Mr. Game and Watch) also relies on Marth's soundbank no matter what character he is ported under. So as of now, unless I remove the text code stating that he uses Marth's sound bank, Roy now sounds like Zelda.