NFS
The Serge New Frequency Shifter is another astonishing (re)design by Serge, much improved over his original 1979 version. Actually it is a combination of two new Quadrature Oscillators plus two(!) Frequency Shifters, offering 5 different modes from separate use to true Stereo Processing.
New Quad Oscillator(s)
New Frequency Shifter(s)
The FREQUENCY SHIFTER does not transpose. Rather it shifts each harmonic of the signal by a fixed value equal to the shifting frequency. Thus, as the shifting frequency becomes larger, the relationships between overtones are altered, and timbres change dramatically.
These merchants probably sell this module. Huh?