Go under Dragon Age/packages/core/audio/vo/en-us/vo and look for your voice file, for example if you chose human male violent it would be ss_pc_mhuman_violent.fev and ss_pc_mhuman_violent.fsb, either delete them or rename them to one of the different voice files.
I made the same mistake the TC probably did, and since i dont want to start over either i tried to change the files around. Bad idea. now all the the manipulated files have stopped working, when i create a character now 3 of the voices/animations are practically absent. No sound, no animation. only the untouched voice files work.
Dunno why but I cant seem to revert this back to default now, but i geuss its better than listening the the really out of place voice in the first place.