The VM1630 is a super-accurate recreation of the vintage Moog/Bode 1630 Frequency Shifter. A frequency shifter is an audio modifier that "shifts" the entire frequency spectrum of the signal by given amount. The VM1630 can shift the spectrum up or down by up to 5000 Hz, and the "downshifted" and "upshifted" signals are simultaneously available. The shift amount and regeneration controls are fully voltage controllable.