Glitch is my favorite pluggin. And it is free. It is a multi-effect unit. An effect the can be used more like a instrument. You can apply a wide variety of effects via a step sequencer. So different beats get different effects. Rather than automate a series of effect in your daw to mangle loops you can step up this single effect to mangle them. Or like me you can keep the tape running and a screw around with endless and go back and sample the cool sounds you make. It is simply endless fun.