A precision adder sums CVs at exact voltages to transpose a sequence by musical intervals

A precision adder combines two or more CV signals with calibrated accuracy, adding a precise offset — most often a whole octave (1V) but also smaller intervals like thirds or fifths — to the incoming pitch CV. Because the offset is exact, it transposes cleanly instead of drifting out of tune. Its signature application is feeding it a fast melodic sequence plus a slower sequence: the slow sequence supplies the transposition, so the fast riff is replayed at rising and falling pitches, producing a long, evolving, key-changing line from two short sequencers.

Examples

Fast 4-step pitch sequence + slow 3-step sequence -> precision adder -> VCO 1V/oct: the 4-note riff transposes to a new root every time the slow sequence advances, giving a 12-step transposing melody.

Assessment

Explain why a precision adder (rather than a plain CV mixer) is used to transpose pitch CV. Describe the two-sequencer patch that yields a transposing melody.