Main Feature: Mixing channels: 12 Line Inputs (4 mono and 4 stereo) GROUP: 4 GROUP Buses + ST Bus AUX: 2 AUX Sends + 2 FX Sends Input channel functions: Compressor CH1-8,HPF(100Hz 12dB/oct), CH EQ(MONO) ±15dB(Max.):High 8kHz shelving/ Mid 250Hz-5kHz peaking(CH1-8,13-16)/ Low 125Hz shelving, CH EQ(STEREO) ±15dB(Max.):High 8kHz shelving/ Mid 2.5kHz peaking(CH9-12)/ Low 125Hz shelving On-board processors: FX1:REV-X(8 PROGRAM, PARAMETER control), FX2:SPX (16 PROGRAM, PARAMETER control) I/O: Mic inputs MIC: 6 Phantom power: 48V phantom power per channel Line inputs LINE: 4 mono + 4 stereo, CH INSERT: 4, RETURN: 1stereo, 2TR IN: 1 stereo Digital I/O: USB Audio USB IN/OUT: iPod, iPhone exclusive