Okay, time for my aerobatics training to actually be useful. An aileron roll is what is mostly described in this thread, pitch up generously (in an aerobatic airplane about 15 to 20 degrees) and the airplane will go ballistic (flying in a parabolic arch rather than through the lift of the wing) and the airplane will roll with aileron input. A slow roll is a mixture of elevator, rudder, and aileron to create a level roll. A barrel roll is sort of a mix between the two. A gradual pitch up combined with aileron and rudder results in a constant positive 1g mix between a loop and a roll.