That’s an interesting one, I know where you’re going with this, one would usually only achieve that "unnatural Voice" sound by using a processor that has a clipper with plenty of distortion and unfortunately (for you) BBP doesn’t does this.
Not to mention, even if I made BBP sound even close to what you want, I’d dread to think what the actual songs would sound like.
My advice is, use a separate digital Mic processor if you desire "grungy" voice and let BBP do what it does best by keeping things clean.
Or even stick your mic through Breakaway Live using the Mic preset with some extra plugins before it…maybe even the Phase Tornado Plugin in there for good measure! 😆
😉 😉