Why hello everyone

Ive got two questions for the android users here

1.) What's a decent android dj app, just to mess around in? I found a few things, but I want something with some effects in it, like a gate and flanger.

2.) How difficult is it to use a bluetooth controller with your phone? I'm on a Droid Razr, and just got GTAIII, and it would be awesome if I could use some sort of controller when I'm just playing at my house