1. Introduction
The BOSS GM-800 is an advanced guitar synthesizer designed to expand the sonic capabilities of your guitar or bass. Utilizing the powerful ZEN-Core Synthesis System, it offers a vast array of sounds, from traditional acoustic instruments to modern synthesizers. This manual provides essential information for setting up, operating, and maintaining your GM-800.
Image 1.1: Front view of the BOSS GM-800 Guitar Synthesizer, showcasing its controls and display.
2. Product Overview
2.1 Key Features
- ZEN-Core Synthesis System: The core sound engine, offering a wide range of high-quality tones.
- Extensive Sound Library: Over 1200 tones and 70 rhythm sounds are available.
- Four Tone Parts + Rhythm: Allows for complex sound layering and rhythmic accompaniment.
- Intuitive Scene Workflow: Organize and recall complete sound setups, including tones, effects, and settings.
- Serial GK Interface: Advanced processing for stable tracking and expressive control with GK-compatible instruments.
2.2 Controls and Connections
The GM-800 features a streamlined interface for easy operation and comprehensive connectivity.
Front Panel Controls:
- OUTPUT LEVEL knob: Adjusts the overall output volume.
- PART buttons (1-4): Select individual tone parts.
- SELECT/GK knob: Navigates menus and selects GK-related settings.
- EXIT, WRITE, MENU, PAGE buttons: For navigation, saving, and accessing system settings.
- CTL1, CTL2 footswitches: Assignable control pedals for various functions.
- Display: Shows current settings, patch names, and menu options.
Rear Panel Connections:
- GK IN/OUT jacks: 1/4-inch TRS phone type for BGK cable connection.
- OUTPUT (L/PHONES, R/MONO) jacks: 1/4-inch TRS phone type for stereo or mono audio output.
- CTL3, 4/EXP1 jack, CTL5, 6/EXP2 jack: 1/4-inch TRS phone type for external control pedals.
- USB COMPUTER port: USB B type for High-Speed USB, USB Audio, and USB MIDI.
- USB MEMORY port: For data backup and updates.
- MIDI connectors (IN, OUT): For MIDI control with external devices.
- DC IN jack: For connecting the power adapter.
Image 2.1: Rear panel of the BOSS GM-800, detailing all input and output connections.
3. Setup
3.1 Power Connection
Connect the dedicated AC adapter (use Roland PSB-1U adaptor only) to the DC IN jack on the rear panel. Ensure the adapter is securely connected to a power outlet.
3.2 Connecting Your Instrument (GK Pickup)
The GM-800 requires a GK-compatible guitar or bass equipped with a Serial GK pickup. Connect your instrument to the GK IN jack using a BGK cable. This interface allows individual string processing for advanced synthesis capabilities.
3.3 Audio Output
- To an Amplifier/Mixer: Connect the OUTPUT (L/PHONES) and OUTPUT (R/MONO) jacks to your amplifier or mixer inputs. Use both for stereo output or the R/MONO jack for mono.
- Headphones: Connect headphones to the OUTPUT (L/PHONES) jack for private monitoring.
3.4 USB and MIDI Connections
- USB COMPUTER: Connect to your computer for USB Audio/MIDI functionality, allowing recording and software control.
- MIDI IN/OUT: Connect to external MIDI devices for control or to send MIDI data.
4. Operating Instructions
4.1 Powering On/Off
To power on, ensure all connections are made, then plug in the AC adapter. To power off, simply disconnect the AC adapter.
4.2 Selecting and Editing Scenes
The GM-800 operates using 'Scenes', which are complete setups including tones, effects, and settings. Use the SELECT/GK knob to browse and select different Scenes. To edit a Scene, press the MENU button, navigate to the desired parameter, and adjust using the knobs. Press WRITE to save your changes.
4.3 Using Control Pedals
The CTL1 and CTL2 footswitches can be assigned to control various parameters, such as switching effects, changing tones, or adjusting volume. External footswitches or expression pedals can be connected to the CTL3, 4/EXP1 and CTL5, 6/EXP2 jacks for additional real-time control.
4.4 Exploring Synth Sounds (General Overview)
The GM-800 offers dynamic and polyphonic synth sounds with fast parameter access. It includes a send/return loop for integrating external effects and TRS MIDI for expanded control. A bass-optimized mode is also available for bass guitarists.
Video 4.1: Overview of the BOSS VG-800 (similar to GM-800) V-Guitar Processor, demonstrating its features and capabilities.
Video 4.2: General demonstration of a BOSS Synthesizer pedal (SY-200), showcasing dynamic and polyphonic synth sounds, fast parameter access, and various modes.
5. Advanced Features
5.1 Custom Guitar Models and Tunings
The GM-800's advanced guitar modeling allows you to simulate iconic guitars and their pickup characteristics. You can instantly switch to custom or alternate tunings, including drop tunings, open string tunings, and more, without physically retuning your instrument.
5.2 Dual Guitar and Split Sound
The unique Dual Guitar function enables combining two distinct sounds into a single hybrid instrument. You can also split these sounds across different strings or before and after specified frets, allowing for complex and creative arrangements.
5.3 String Bend and Harmony Functions
The String Bend feature allows real-time pitch changes of specific strings, emulating techniques like a B-bender. The Harmony function creates ensemble effects from single notes or chords, adding richness and depth to your sound.
6. Connections
The GM-800 offers versatile connectivity options to integrate into any setup:
- GK IN/OUT: For connecting GK-compatible instruments and other GK gear.
- GUITAR INPUT: For accessing flagship guitar processor sounds from a standard guitar pickup.
- SEND/RETURN (STEREO): Stereo send and return jacks for integrating external effects pedals.
- OUTPUT (R/MONO, L/PHONES): Main audio outputs for amplifiers, mixers, or headphones.
- MIDI IN/OUT: For MIDI control and synchronization with external MIDI instruments or DAWs.
- USB COMPUTER: Provides USB Audio/MIDI connectivity for recording, editing, and software integration.
- USB MEMORY: For loading/saving data and system updates.
- CTL 2, 3/EXP 1, CTL 4, 5/EXP 2: External control jacks for footswitches or expression pedals to manipulate parameters in real-time.
7. Maintenance
7.1 Cleaning
Wipe the unit with a soft, dry cloth. Avoid using abrasive cleaners, waxes, or solvents that could damage the finish.
7.2 Software Updates
Periodically check the BOSS website or use the BOSS Tone Studio software for firmware updates to ensure optimal performance and access to new features.
7.3 Storage
When not in use, store the GM-800 in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity.
8. Troubleshooting
8.1 No Sound Output
- Check all cable connections (instrument, output, power).
- Ensure the OUTPUT LEVEL knob is turned up.
- Verify that your amplifier or monitoring system is powered on and functioning correctly.
- Confirm that the correct input is selected on your amplifier/mixer.
8.2 Unexpected Behavior
- Perform a factory reset if the unit behaves erratically. Refer to the full owner's manual for specific instructions on performing a factory reset.
- Ensure the firmware is up to date.
9. Specifications
| Feature | Specification |
|---|---|
| Item Weight | 2.65 pounds (1.2 kg) |
| Product Dimensions | 5.28 x 9.69 x 2.48 inches (13.4 x 24.6 x 6.3 cm) |
| Item Model Number | BOS-GM-800 |
| Connector Type | USB Type B |
| Hardware Interface | USB |
| Signal Format | Analog |
| Power Source | USB Powered (or dedicated AC adapter) |
| Body Material | Wood (Chassis is metal) |
10. Warranty and Support
For detailed warranty information and customer support, please refer to the warranty card included with your product or visit the official BOSS website. Online resources, FAQs, and contact information for technical assistance are available there.
