I used a certain chorus type on cool edit pro, can't recall off hand which it is. I also used chamber reverb and then added some delay. I'm not actually sure how much that would effect the understandibility (if thats a word) of the lyrics either. I think I just slurred the words enough and speak lazy enough for it to be hard to understand. But I might take it off and repost it and see if its any more understandable.