Dunno I'm using Digidesign's Lo-Fi on it here which is a warm analog type distortion, still pretty nasty on a complex sound but just does nice things to a triangle wave. Digital distortion and guitar amp simulations are probably both a bit complex/hectici. Try whatever plugin's you've got to hand, there's probably one that'll do built into your app.

If it's not working then I'll upload a sample of what I'm getting so you can see what I mean.