No info about availability.
Frequency Shifter
The main purpose with the frequency shifter is to make frequency shift up and down for processed audio signal. Two signal sources are needed; the carrier and the audio. Both carrier and audio signals are split into two chains and are pre-processed to accomplish a 90 degree phase shift between split signals.
The carrier generator has two frequency ranges; LF (low frequency) and AUDIO and it's controlled by knobs:
COARSE
FINE
CARRIER CV (external CV signals)
The FSH-1 works in two modes:
1. frequency shifter
2. dual ring modulator
A ring modulator is a classic audio effect device and due to the non-harmonic character of the output signal. It's very useful to create metallic timbres such as bells, sweeping whistles and percussive sounds and tremolo effects. The obvious effect (particularly in LF mode) is a stereo panning effect of audio signal.
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These merchants probably sell this module. Huh?