Some XENYX mixers come with a built in effects unit, here is a list of the effect presets installed on each unit: FX Series XENYX 1002FX- http://www.behringer.com/assets/1002FX_P0572_V_YY.pdf XENYX 1202FX- http://www.behringer.com/assets/1202FX_P0571_V_YY.pdf