Matrix Mixer

10 channel matrix mixer with 10 inputs, 3 sets of 4 outputs (A-D), and Left/Right monitor out which patches internally to a Model 207 or 227. Left Out A-D mixes inputs 1-5, Right Out A-D mixes input 6-10, All Out A-D" mixes all 10 inputs. Switches on inputs add or remove channels to monitor outs.