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Octave effect boxes are a type of special effects unit which mix the input signal with a synthesized signal whose musical tone is an octave lower or higher than the original. The synthesised octave signal is derived from the original input signal by halving (octave-down) or doubling (octave-up) the frequency.
The Voyetra-8 (Voyetra-Eight) is an eight voice polyphonic analog synthesizer.Released in 1982 by Octave-Plateau Electronics (later renamed Voyetra and still later merged with Turtle Beach Systems to become Voyetra Turtle Beach, Inc.), it was one of the first analog programmable synthesizers to be rack-mountable and remains one of the most flexible digitally controlled analog synthesizers.
One volt represents one octave, so the pitch produced by a voltage of 3 V is one octave lower than that produced by a voltage of 4 V. Each 1 V octave can be divided linearly into 12 semi-tones. Companies using this CV method included Roland , Moog , Sequential Circuits , Oberheim , ARP and the Eurorack standard from Doepfer , including more ...
Moog designed his synthesizer around a standard of one volt per octave, and used voltage to control loudness with voltage-controlled amplifiers (VCAs). [3] Moog developed a prototype with two VCOs and a VCA. As the VCOs could output voltage, one could be used to modulate the output of another, creating effects such as vibrato and tremolo. [3]
The Freeman String Symphonizer was a 5-octave synthesizer of the 1970s. (The first prototype being shown prior to 1970, but the most well known shown in 1970, the second according to the Sound on Sound article) It was finally manufactured by the Chicago Musical Instrument Co. and was also known as the Cordovox CSS.
The design of the Polymoog is a hybrid of the electronic organ and the synthesizer using divide-down technology, much like other string synthesizers of the time. Unlike later 1970s polyphonic synthesizers, such as the Yamaha CS-80 and Sequential Circuits Prophet-5 , the Polymoog cannot create each voice from individual oscillators and filters ...
While the basic synthesizer architecture of the Micromoog was a simple VCO/VCF/VCA, inexpensive enhancements provide different creative options than the Minimoog. Its single voltage-controlled oscillator's waveshape is variable from sawtooth to pulse, [3] which can also be modulated. Additionally, a sub-octave can be added one or two octaves below.
PPG Wave 2.2 front panel. PPG's Wave series represents an evolution of its predecessor by combining its digital sound engine with analog VCAs and 24db per octave VCFs, featuring 8-voice polyphony; and by replacing its nontraditional series of push buttons and sliders with a control panel consisting of an LCD and a more familiar arrangement of knobs.