Yamaha MG12XU 12-Input 4-Bus Mixer with Effects 12-Channel mixer with USB and SPX digital effects Featuring studio-grade discrete class-A D-PRE preamps with inverted Darlington circuit - providing fat, natural sounding bass and smooth, soaring highs 3-band EQ and high-pass filters give you maximum control and eliminate unwanted noise, resulting in a cleaner mix 1-Knob compressors allow easy control - resulting in livelier guitars, punchier bass lines, a tighter snare and a cleaner vocal sound. MG Series mixers feature a rugged, impact-resistant, powder-coated metal chassis