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Thank you, and congratulations on your choice of BOSS OC-20G GK Effect.
Before using this unit, carefully read the sections entitled: “USING THE UNIT SAFELY”
and “IMPORTANT NOTES” (p. 18; p. 21).
These sections provide important information concerning the proper operation of the unit.
Additionally, in order to feel assured that you have gained a good grasp of every feature
provided by your new unit, Owner’s manual should be read in its entirety. The manual should
be saved and
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Installing Batteries Insert the included batteries as shown in figure, being careful to orient the batteries correctly. fig.02 • When turning the unit upside-down, get a bunch of newspapers or magazines, and place them under the four corners or at both ends to prevent damage to controls. Also, you should try to orient the unit so no controls get damaged. • When turning the unit upside-down, handle with care to avoid dropping it, or allowing it to fall or tip over. • Make sure the “+” and “
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Making the Connections About the GK-2A To use the OC-20G with a guitar equipped with the GK-2A (or other GK- compatible guitar), you will need an optional GK cable. Refer to the GK-2A Owner’s Manual for instructions on installing the GK-2A. S1/S2 Switch The GK-2A’s S1/S2 switches correspond to this unit’s MASTER On/Off pedal and Distortion On/Off pedal, respectively. Selection Switch Set to the “MIX” position. Note that this unit processes tones using the instrument’s divided pic
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Making the Connections • To get the best performance from the instrument, set your amp to “Clean” (no distortion). • When connecting the instrument to a guitar amp, make the necessary adjustments to get the most suitable tone. When recording direct, use this with a COSM amp (GT-3, GP-20 etc.). • When connecting a GK cable, insert the cable completely until the connector is securely locked. When disconnecting, press the connector’s lock while you detach the cable. * Always turn the
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Operating Instructions Using the Pedals “MASTER: ON” and “DISTORTION: OFF” are selected when the power is turned on. fig.04 When at “ON” When at “OFF” When at “ON” When at “OFF” ➝ ➝ Illuminated Extinguished Illuminated Extinguished Master is toggled on and off by stepping Distortion is toggled on and off by on the MASTER On/Off pedal. stepping on the Distortion On/Off pedal. When switched on, the GK effect When Master is off, you can switch sound is output. the distortion on and off in or
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Operating Instructions Panel Operations In order to follow along with the instructions given here, you should start out by having Master switched ON (depress the MASTER On/Off pedal and confirm that the MASTER ON/OFF indicator has lighted). Also, step on the Distortion On/Off pedal to switch OFF distortion (DISTORTION ON/OFF indicator extinguished). You should make GK LEVEL, OCTAVE LEVEL, DISTORTION, TONE, and LEVEL adjustments after first aligning the knob to the center position. fig.05
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Part Names and Functions Front Panel OCTAVE fig.06 TYPE Knob Select the tone for the GK Direct sound (the sound at the original pitch). ACOUSTIC HARD: Bright and lively acoustic guitar sound. ACOUSTIC MEDIUM: Acoustic guitar sound between HARD and SOFT. ACOUSTIC SOFT: Richly resonant acoustic guitar sound with body. OCTAVE LEVEL ELECTRIC REAR S: Rear single coil pickup tone. Knob ELECTRIC REAR H: Rear humbucking pickup tone. Adjusts the volume of ELECTRIC FRONT H: Front humbucking pi
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Part Names and Functions DISTORTION fig.07 DISTORTION Knob LEVEL Knob Adjusts the amount of Adjusts the distortion distortion. volume. TONE Knob Adjusts the tone quality of the distortion sound. 8
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Part Names and Functions fig.08 POWER Indicator This lights up when the power is on. If this gets dim or fails to light up when the unit is running on battery power, it means that the batteries are depleted. Replace promptly with fresh batteries. “Installing Batteries” (p. 2) MASTER ON/OFF DISTORTION Indicator ON/OFF Indicator This lights up when Master This lights up when is on. distortion is on. Master On/Off Pedal Distortion On/Off Pedal Each press of the pedal switches Each press o
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Part Names and Functions Rear Panel fig.9 NORMAL PU MIX Switch When Master is on, this switch determines whether or not the normal pickup sounds (or the sounds input to the GUITAR RETURN) are mixed. AC ADAPTOR Jack This jack is for connecting an By mixing the normal pickup sound, AC adapter (BOSS PSA-series, you can create a sound that makes sold separately). your guitar sound come alive. Using an AC adapter makes possible long performances GK IN Connector with no worry about batte
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Application Examples Using in Combination with Other Effect Devices fig.10 Guitar with GK-2A or other GK-compatible guitar AC Adaptor PSA-series (sold separately) OUTPUT INPUT External Effector Guitar Amp 11
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Application Examples Using in Combination with Another GK EFFECT (WP-20G) fig.11 OC-20G AC Adaptor PSA-series (sold separately) WP-20G AC Adaptor PSA-series Guitar with GK-2A (sold separately) or other GK-compatible guitar GK IN Guitar Amp US-20 12
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Application Examples Using in Combination with the GR-33 fig.12 Guitar with GK-2A or other GK-compatible guitar AC Adaptor PSA-series (sold separately) RETURN GK IN MIX OUT GK guitar amp simulator: ON US-20 GR-33 Power Amp + Speaker 13
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Troubleshooting The power doesn’t come on. ❍ Is the external device connected correctly to the OUTPUT jack? ➔ Check the connections again. * When running off batteries, the unit won’t switch on unless there’s something plugged into the OUTPUT jack. This helps conserve the batteries. ❍ Have the batteries run down? ➔ Replace with fresh batteries (p. 2). ❍ Is the specified AC adaptor (PSA-series sold separately) connected correctly? ➔ Check the connections agai
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Troubleshooting No effects are being applied. ❍ Is the GK-2A’s selection switch set to “MIX?” ➔ When set to “GUITAR” or “SYNTH,” the necessary signals may not be input to the unit, which may prevent effects from being applied. ❍ No effects are applied to sounds input to GUITAR RETURN and normal pickup sounds. Noise is produced. ❍ Is the external device connected to the GUITAR RETURN jack working properly? ➔ When the GUITAR RETURN jack is used, the signals input to this jack ar
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Sample Settings Warm Octave Sound fig.13 Acoustic Sound (String 5, 6: Bass) fig.14 Heavy Distortion Sound fig.15 16
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Specifications Residual Noise Level OC-20G: GK EFFECT -96 dBu Controls (GK IN: terminated, Effects: OFF, Normal Master On/Off Pedal PU Mix: OFF, IHF-A, typ.) Distortion On/Off Pedal Power Supply TYPE Knob DC 9 V: Dry Battery x 6, AC Adaptor STRING SELECT Knob OCTAVE LEVEL Knob Current Draw GK LEVEL Knob 150 mA (9 V, with GK-2A) DISTORTION Knob * Expected battery life under continuous use: TONE Knob Carbon : 2 hours LEVEL Knob Alkaline : 6 hours NO
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USING THE UNIT SAFELY Used for instructions intended The symbol alerts the user to important to alert the user to the risk of instructions or warnings. death or severe injury should The specific meaning of the symbol is the unit be used improperly. determined by the design contained within the triangle. In the case of the symbol at left, it is used for general cautions, warnings, or Used for instructions intended alerts to danger. to alert the user to the risk of
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Read this information ”USING THE UNIT SAFELY“ 008b 012c • Use only the specified AC adaptor, • Immediately turn the power off, and make sure the line voltage at remove the AC adaptor from the the installation matches the input outlet, and request servicing by voltage specified on the AC your retailer, the nearest Roland adaptor’s body. Other AC Service Center, or an authorized adaptors may use a different Roland distributor, as listed on the polari
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019 109b • Batteries must never be recharged, • Before cleaning the unit, turn off the heated, taken apart, or thrown into power and unplug the AC adaptor fire or water. from the outlet (p. 3). .......................................................................................... 110b • Whenever you suspect the possibility ......................................................................................... of lightning in your area, dis
