Sweeper Modulation Effect Introduction The Sweeper Modulation Effect device is a great sounding Phaser/Flanger/Filter device. By drawing your own unique modulation curve in the display and assigning this curve to the desired effect parameters, you also get a very flexible system for repeatedly sweeping/modulating the effects parameters - in perfect sync with the sequencer. Sweeper is designed to be used mainly as an insert effect, for spicing up instrument sounds with nice sweeps and modulations, but you could of course use it as you like!