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Roland GR-300
1984 Magazine Advertisement
General Specs
Controls: Hexa VCO: Master Tuning, Pitch A (±1300 cent), Pitch B(±1300 cent), Pitch LATCH/UNLATCH Switch (2), Sweep Rise Time (0-6 sec), Sweep Fall Time (0-0 sec), LFO Rate (2-10 Hz), VCF: Preset A Attack Time (0-2 sec), MOD Sens, Preset B Attack Time (0-2 sec), MOD Sens, VCA: Compression Switch (Long Sustain), Footswitch: COMP (Envelope Compression), Pitch A (Pitch A/OFF Select), Pitch B (Pitch B/OFF Select), ENV MOD (VCF Envelope MOD). ENV INV (ENV MOD Invert) String Select: 1-6 Select Switch 6, String indicator 6 ,EXT Foot Control: String Select Switch, Sweep ON/OFF, VCF Pedal, Compression Switch
Input: 24-Pin Connector
Output: MIX/SYNTH Guitar
Years in use: 1981
Website: http://www.rolandus.com/ 
The GR-300 was considered the first "playable" guitar synthesizer. (It's predecessor, the GR-500, was plagued with tracking problems that rendered it virtually unplayable.) The GR-300 had no MIDI and could only be played through a GR-300 series guitar controller.

The actual synthesizer module sat on the floor and had the rugged appearance of a large guitar-type foot pedal (complete with carrying handles). It featured 6-voice polyphony, one voice per string and 2 oscillators per voice. Each pair of VCOs were harmonically locked to each string but could be tuned separately to play different pitches. The GR-300 also featured a VCF with variable lengthsweep up and down, and an LFO. Each string had an enable-disable switch as well as a string sensitivity switch (basically audio compression). Built-in footswitches controlled the VCO mode (single/dual), the VCO harmonize pitch (detuning of the VCO's), and the VCF mode (on, bypass, or inverted). There was also a pedal control input for the VCF. The GR-300 could output either the guitar, the synth, or a mix of the two.

Jimmy Page used a Roland G-505 Guitar Synthesizer Controller Guitar, G-808 Guitar, TR-808 Rhythm Composer and (2) GR-300 Guitar Synthesizers (connected via US-2 Unit Switcher) in composing the soundtrack to the 1982 movie Death Wish II.

Photos

Roland GR-300
Japanese Magazine Advertisement
Roland GR-300
Japanese Magazine Advertisement
Roland GR-300
Japanese Magazine Advertisement
Roland G-707
Roland GR-300
Roland G-707
Roland GR-300
Roland G-707
Guitar Player, April 1982 Advertisement
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