Erica Synths Black Multi is a highly accurate active buffered 2x1 to 3 or 1 to 6 multiple that works for signal splitting in any circuit, including driving several VCOs in tune from one CV source. “Octave” or ±1V offset switches on both channels allow adding or subtracting one volt from each channel, thus transposing VCOs one octave up or down. A hidden feature - custom offset - allows setting a user-defined offset on the first channel.