Various effects and pedals are compact powerhouses for modifying your sound. There are hundreds of sounds effects available in a wide range of form-factors. Some units focus on a single effect (such as distortion) while others give you a wide palette of options for customizing amazing audio modifications. Most can be chained together and used individually or in combination as you activate one or more. Some use a simple push-button on/off switch, others use expression pedals to vary the effect. You can also use wireless accessories and Internet downloads with some units for even more dramatic effect control.