Analog stepped-attenuator volume control : No level control IC's used - pristine, accurate and repeatable. 4 input sources - Switch between your DAW outputs, DVD player, CD player, tape machines, etc.- 3 speaker outputs - Switch between up to 3 sets of monitors - Programmable input gain offsets Adjust for and store level offsets for different source devices - Input level compensation for -10dBV and +4dBu sources - Instantly adjust and store gain compensation for consumer devices - Input 4 has continuously variable level offset - Compensate for commercial CD levels and perform true A/B - omparisons without compromising sound quality.- Programmable output level offsets - Fine-tune and store offsets to achieve equal apparent loudness on all your control room speakers- SR unit has continually variable level trims for L-R rear, center and LFE. - Assignable subwoofer output - Choose and store which sets of speakers you want to use with your sub - Programmable subwoofer level offset - Adjust and store subwoofer levels, easily alternate between sub function and LFE function - Selectable subwoofer filtering - Select and store subwoofer filter options for each set of speakers. Switch between full bandwidth for surround mixing and bottom octave only for stereo work.- Comprehensive speaker Mute and Solo - Easily mute and solo speakers in any combination - Flexible stereo cue system with main and auxiliary inputs - Make your performers happy with a great headphone mix or use the aux input as a Beep channel to monitor computer alert tones or click tracks on the main speakers.- Onboard cue power amp - 40 watts of clean power for your - eadphones - Talkback system with dual control and dedicated slate output - Give the producer his own talkback button! Easily slate tracks, or send the slate output to a powered speaker for open-air talkback - SR unit has selected source output - Send source signals to meters or any other external device - Gain Tracking Accuracy: better than 0.05dB for 6 channels