The Roland GR-500 is a guitar synthesizer. Manufactured by the Roland Corporation and FujiGen in 1977, it was one of the first guitar synthesizers. [1] [2]
The synthesizer module included Polyensemble, Bass, Solo Synth, and External synthesizer control. Much of the voltage-controller filter and voltage controlled amplifier sections were based on previous analog mono-synths from Roland. Sliders adjust the VCO, VCF, VCA, and LFO sections; there is no memory to store settings.
The synth module is controlled by a highly modified guitar: the GS-500 guitar controller was built in a partnership between Roland and the large Japanese guitar builder FujiGen. The result was the Fuji Roland Corporation, established in 1977 through a joint capital investment.
The GS-500 controller used a special pickup system that connected to the synth module via Roland's own 24-pin interface. Controls on the guitar primarily were for adjusting the relative volume of the different sections: guitar, polyensemble, bass, solo section, and external synth. The GS-500 guitar does not have a standard 1/4-inch guitar output and cannot be used without the GR-500 synthesizer module. It has a particular infinite sustain system: the frets in the GR-500 are connected to its electrical ground, and when a player frets a string, an electric current passed through the string. The electric signal passing through the string is a greatly amplified version of the string signal detected by the divided hexaphonic pickup. Large magnets replaced the traditional "neck" pickup. As a result of Fleming's Law, the alternating electric current in the string passing through the strong magnetic field caused the string to vibrate and create a feedback loop and infinite sustain. The GS-500 used a bridge with plastic saddles to electrically isolate each string.
Here is a brief description of each section:
Guitar: this is the output from a humbucking pickup. A three position EQ switch, plus tone control, provided variation to the guitar signal. There is also an optional mild peaking filter, somewhat similar to a wah-wah pedal, on the GR-500 module.
Polyensemble: this is not a true synthesizer section, but rather a unique distortion circuit using custom Roland "trigger pulse generator" chips. These chips are covered in epoxy so the actual circuit is unknown. The output of the Polyensemble is sent to an Attack/Decay/Sustain (ADS) Envelope Generator, one of three identical ADS Envelope Generators in the GR-500.
Bass: This is a true, pitch-to-voltage analog guitar synthesizer section. The pitch detection circuit makes use of another proprietary Roland part: the "fundamental generator" chip. Like the polyensemble, the bass output passes through an ADS Envelope Generator. Bass can be output on all six strings, just 4, 5 and 6, or only on 5 and 6.
Solo Melody: this section is very close to a traditional analog monophonic synthesizer. Using the same proprietary Roland "fundamental generator" chip, the possible waveforms include 16' pulse, 8' pulse, and sawtooth waveform. The -24 dB per octave voltage-controlled filter is self-oscillating, with string-pitch tracking. In addition to the same ADS Envelope Generator found in the Polyensemble and Bass, there is a triangle wave LFO to modulate pulse width or the filter cutoff. The filter can also be used to process the output of the polyensemble section, and an external input.
External Synth: This section was designed for control over external synthesizers.
There are two versions of the GR-500. Later versions added an extra oscillator so that the Solo Melody section could be detuned from the rest of the synthesizer, resulting in a richer, "fatter" sound.
The most effective use of the GR-500 may be found in the Polyensemble section, which, when combined with the infinite sustain system, made for a rich, symphonic sound. Also, the Polyensemble section, being basically a complex distortion circuit, did not require any pitch-to-voltage tracking, and so was not plagued by the pitch tracking errors common with early guitar synths. The Bass and Solo Melody sections work reasonably well.
Roland also produced the very rare FC-50 Foot Controller for the GR500 which allowed three presets to be saved and recalled by the user as well as a selector for manual control.
Modular synthesizers are synthesizers composed of separate modules for different functions. The modules can be connected together by the user to create a patch. The outputs from the modules may include audio signals, analog control voltages, or digital signals for logic or timing conditions. Typical modules are voltage-controlled oscillators, voltage-controlled filters, voltage-controlled amplifiers and envelope generators.
CV/gate is an analog method of controlling synthesizers, drum machines, and similar equipment with external sequencers. The control voltage typically controls pitch and the gate signal controls note on-off.
The Roland JX-3P is a synthesizer produced by Roland Corporation of Japan from 1983–1985. The "3P" in its name refers to "Programmable Preset Polyphonic". It is notable as one of the company's first synthesizers to incorporate a MIDI interface.
Ensoniq ESQ-1 is a 61-key, velocity sensitive, eight-note polyphonic and multitimbral synthesizer released by Ensoniq in 1985. It was marketed as a "digital wave synthesizer" but was an early Music Workstation. Although its voice generation is typically subtractive in much the same fashion as most analog synthesizers that preceded it, its oscillators are neither voltage nor "digitally controlled", but true digital oscillators, provided by a custom Ensoniq wavetable chip. The signal path includes analog resonant low-pass filters and an analog amplifier.
The ARP Odyssey is an analog synthesizer introduced by ARP Instruments in 1972.
The Roland MC-202 (MicroComposer) is a monophonic analog synthesizer and music sequencer released by Roland in 1983. It was the first groovebox. Its synth is similar to the TB-303 bass synth and the SH-101 synthesizer, featuring one voltage-controlled oscillator with simultaneous saw and square/pulse-width waveforms. It is a successor to the Microcomposer family of sequencers, including the MC-8 and MC-4. The unit is portable and can be operated from batteries or an external power supply.
The Moog synthesizer is a modular synthesizer invented by the American engineer Robert Moog in 1964. Moog's company, R. A. Moog Co., produced numerous models from 1965 to 1981, and again from 2014. It was the first commercial synthesizer and established the analog synthesizer concept.
The Yamaha GX-1, first released as Electone GX-707, is an analog polyphonic synthesizer developed by Yamaha as a test bed for later consumer synths and Electone series organs for stage and home use. The GX-1 has four synthesizer "ranks" or three manuals, called Solo, Upper, and Lower, plus Pedal, and an analog rhythm machine. The GX-707 first appeared in 1973 as a "theatre model" for use on concert stages, before the GX-1 was publicly released in 1975.
The Multimoog is a monophonic analog synthesizer manufactured by Moog Music from 1978 to 1981. Derived from the earlier Micromoog, the Multimoog was intended to be a less expensive alternative to the Minimoog. It nevertheless had some advanced features which the Minimoog did not—most notably, it was one of the earliest synthesizers to feature aftertouch capability.
The Moog model 2090 Micromoog is a monophonic analog synthesizer produced by Moog Music from 1975 to 1979.
A wind controller, sometimes referred to as a wind synthesizer, is an electronic wind instrument. It is usually a MIDI controller associated with one or more music synthesizers. Wind controllers are most commonly played and fingered like a woodwind instrument, usually the saxophone, with the next most common being brass fingering, particularly the trumpet. Models have been produced that play and finger like other acoustic instruments such as the recorder or the tin whistle. The most common form of wind controller uses electronic sensors to convert fingering, breath pressure, bite pressure, finger pressure, and other gesture or action information into control signals that affect musical sounds. The control signals or MIDI messages generated by the wind controller are used to control internal or external devices such as analog synthesizers or MIDI-compatible synthesizers, synth modules, softsynths, sequencers, or even non-instruments such as lighting systems.
The ARP Little Brother, produced from 1975 to 1977, is a keyboardless monophonic expander module, sold as an add-on for another ARP synthesizer. It was controlled by connecting the control voltage (CV) output of an ARP synthesizer's keyboard to the Little Brother's CV input.
The Doepfer A-100 is an analog modular synthesizer system introduced by German audio manufacturer Doepfer in 1995. Although there were only 10 module types at time of release, it currently has more than 120 modules plus several different enclosures and accessories.
A guitar synthesizer is any one of a number of musical systems that allow a guitarist to access synthesizer capabilities.
The Yamaha CS30/CS30L is an analog keyboard synthesizer that was released in 1977. It is the top of the range in Yamaha's original line-up of monophonic synthesizers, others in the range being the CS5, CS10 and CS15. It features two voltage controlled oscillators (VCOs), two voltage controlled filters, two voltage controlled amplifiers (VCAs) and three envelope generators. It also sports a ring modulator and a voltage controlled low-frequency oscillator (LFO).
A synthesizer is an electronic musical instrument that generates audio signals. Synthesizers typically create sounds by generating waveforms through methods including subtractive synthesis, additive synthesis and frequency modulation synthesis. These sounds may be altered by components such as filters, which cut or boost frequencies; envelopes, which control articulation, or how notes begin and end; and low-frequency oscillators, which modulate parameters such as pitch, volume, or filter characteristics affecting timbre. Synthesizers are typically played with keyboards or controlled by sequencers, software or other instruments, and may be synchronized to other equipment via MIDI.
The Korg PS-3300 is a polyphonic analog synthesizer released by Korg in 1977. It was released alongside the PS-3100, a more compact variant featuring a complete synthesizer voice board for each of its 48 keyboard notes. The PS-3300 essentially combines three PS-3100 units, triggering all voices simultaneously with each key press and mirroring the PS-3100's overall design, featuring a total of 144 synth voices. The PS-3300 uses the PS-3010, a detachable keyboard equipped with an assignable joystick called the X-Y Manipulator.
The Roland GR-300 is an analog guitar synthesizer manufactured by Roland Corporation. It was introduced to market in 1980.
Paraphony is a term which has three distinct meanings in the field of music.
The Korg Trident is a polyphonic multi-section synthesizer released by Korg in 1980, combining three distinct synthesizers within a single instrument: a polyphonic section with two VCOs, alongside dedicated String and Brass sections. The polyphonic synthesizer section allows for eight-note polyphony with dual oscillators. The String section offers an ensemble effect and simple attack/release envelope controls, whereas the Brass section features an independent filter and a dedicated ADSR envelope. These sections can be assigned to two different regions of the keyboard independently, and the Trident also offers a flanger effect along with a joystick for pitch bending and modulation.
USpatent 4137811,Ikutaro Kakehashi,"Electrical String-Instrument",issued February 6, 1979
USpatent 4181058,Noboru Suenaga,"Electrical String-Instrument",issued January 1, 1980