Here is a vintage 1974 Electro-Harmonix Frequency Analyzer electric guitar effects pedal. Unlike other ring modulators, this early production Frequency Analyzer with early font-type graphic and original large space ship saucer knobs, has controllable high order filters that reduce cross distortions and enhance the variations. The shift and fine controls let the user set a frequency that will be both added and subtracted from the original note or chord, while the blend control enables the user to mix the new notes with the original. This rare version required a 2-prong power cable, which will be included.
This particular example is in extremely excellent condition with all of the original paperwork and a non-original indestructo cardboard box.