In dragon universe mode, you can unlock 21 original voice data in the bonus section, by using special abilities with the opponents with all the characters.

voice data 00: goku vs raditz - use kamehameha
voice data 01: piccolo vs raditz - use special beam cannon
voice data 02: tien vs nappa - use ki blast cannon
voice data 03: kid gohan vs nappa - use masenko
voice data 04: krillin vs frieza(third form) - use destructo disk
voice data 05: goku vs frieza(100% full power) - use super saiyen
voice data 06: yamcha vs dr. gero - use senzu bean
voice data 07: piccolo vs cell - use fuse with kami
voice data 08: vegeta vs cell(absorb 17 form) - life more than 2500
voice data 09: vegeta vs cell(perfect form) - use final flash
voice data 10: teen gohan vs goku - use super sayan
voice data 11: teen gohan vs cell(super perfect form) - use father-son kamehameha
voice data 12: vegeta vs majin buu - use final explosion
voice data 13: goku vs majin buu - use super sayan 3
voice data 14: win after time limit passes 60
voice data 15: gohan vs super buu - use elder kai unlock ability
voice data 16: goku vs kid buu - use super spirit bomb
voice data 17: vegeta vs ss4 goku - use super saiyan 4
Voice data 18: SS4 Gogeta vs. Omega Shenron/Earth. Use 100X Big Bang Kamehemeha
voice data 19: broly vs gohan - use gigantic meteor
voice data 20: uub vs goku - use ki cannon