This is the most powerful CREST AUDIO analog mixer console ever built from this manufacturer.it is used for almost any musical setups,all channels works absolutely amazing,all marked controllers visible,,now this is 40/12/ sends equivalent to 52 channels total. There's two other mixers in the pictures, ALLEN& HEATH ML3000 MODEL # also 40/8 channels another powerful mixer with everything working absolutely amazing on it,,now the 3rd console in the pictures is,SOUND TECH S832 MODEL 32 CHANNELS ANALOG MIXER . All this Mixers are in excellent condition and will be fully tested before buying thanks any questions please fill free to contact me or text. Thanks