Use the 2 large effect levers to control up to 57 effects in Serato DJ Pro (including paid Expansion Packs). The levers are the same size as those on the flagship DJM-S11 and you can hold them down or release them to turn the effect on / off, or lock them on so your hands are free to browse and scratch tracks while the effect is still applied. There are also 2 banks where you can save effects, giving you quick access to your favorites