MiniMod Precision Voltages

A precision voltage source and adder for 1V/octave pitch. Two channels each add or subtract whole octaves and notes, set on an eleven way OCTAVE and a twelve way NOTE switch, each with its own plus, off, minus switch; with nothing patched a channel is a voltage source, with an input it adds its voltage to it, to +/-2 mV over +/-10 V. A gate input turns channel A's transposition on and off while the input still passes through, a combination switch gives A+B, A or A-B, and a calibration output accurate to +/-0.5 mV tunes VCOs without test equipment.