Behringer NOX606 PRO Mixer Premium 6-Channel DJ Mixer with Optical VCA Crossfader, Beat-Syncable FX, VCFs and USB Interface Premium 6-channel club DJ mixer for the most demanding turntablist, remixer and digital DJ 45-mm Infinium "contact-free" optical crossfader with adjustable friction and fader curve for years of use Beat-syncable FX section with 2 parameter controls assignable to Mic, 1, 2, 3, 4 or Master 2 mind-blowing VCFs (Voltage Controlled Filters) can be assigned to any channel or crossfader side 2 independent LFOs (Low Frequency Oscillators) for awesome filter modulation