turn the single main knob

It supports several control modes:

each with up to 18 channels

Simple answer: because it sounds way better

EUROLITE Set 6x AKKU TL-3 TCL Trusslight QuickDMX + Case TDV-1 Bravo-musik turn the single main knob6x Trusslight with 3 x 3 W 3in1 LED including universal case EUROLITE AKKU TL 3 TCL Trusslight QuickDMX Spot for lighting within trussing, 3 x 3 W 3in1 LED, QuickDMX transceiver Compact and bright Ideal for ALUTRUSS DECOLOCK DQ3 3 point system Integrated QuickDMX transceiver for wireless DMX control Threaded inserts for suspended installation Cordless, flexible and versatile Battery operation up to 16h depending on program used 3 LEDs 3 W SMD 8072