Introduction
The Electro-Harmonix Bass Micro Synthesizer is an analog effects pedal designed specifically for bass guitar. It allows bassists to create a wide range of classic analog synthesizer sounds, from percussive stabs to bowed-like textures. This manual provides detailed instructions for setting up, operating, maintaining, and troubleshooting your Bass Micro Synthesizer.

Image: The Electro-Harmonix Bass Micro Synthesizer pedal, showcasing its sliders and footswitch.
Setup
- Power Connection: Connect a 9V DC power adapter (center-negative) to the 9V jack on the pedal. Ensure the power supply meets the pedal's requirements.
- Instrument Connection: Connect your bass guitar to the INPUT jack on the right side of the pedal using a standard 1/4-inch instrument cable.
- Amplifier Connection: Connect the OUTPUT jack on the left side of the pedal to your amplifier or other effects pedals using a standard 1/4-inch instrument cable.
- Activation: Press the footswitch to engage or bypass the effect. The LED indicator will illuminate when the effect is active.
Operating Instructions
The Bass Micro Synthesizer features a series of slider controls divided into two main sections: Voice Mix and Filter Sweep. Experiment with different combinations to discover a wide array of sounds.
Voice Mix Controls
- TRIGGER: This slider controls the input sensitivity. Higher settings make the pedal more responsive to a lighter touch, while lower settings require a stronger attack to trigger the synth effect.
- SUB OCTAVE: Adjusts the volume of a synthesized note one octave below the original bass signal.
- GUITAR: Controls the volume of your dry (unaffected) bass signal. This allows you to blend your original tone with the synthesized sounds.
- OCTAVE: Adjusts the volume of a synthesized note one octave above the original bass signal. This primarily emphasizes harmonics and adds presence, especially when playing higher notes.
- SQUARE WAVE: Controls the volume of a square wave distortion/fuzz effect, adding a gritty, synth-like texture.
Filter Sweep Controls
- ATTACK DELAY: This slider controls the attack time of the filter. Higher settings introduce a slower, more gradual filter opening, creating a bowed or swelling effect. Lower settings provide a more immediate filter response.
- RESONANCE: Adjusts the Q (peak) of the filter. Higher resonance settings create a more pronounced and vocal-like filter effect.
- START FREQ: Sets the initial frequency point of the filter sweep.
- STOP FREQ: Sets the final frequency point of the filter sweep. The filter sweeps between the START and STOP frequencies.
- RATE: Controls the speed at which the filter sweeps from the START FREQ to the STOP FREQ.
By manipulating the START and STOP FREQ sliders, you can control the direction of the filter sweep. If START FREQ is lower than STOP FREQ, the filter sweeps upwards. If START FREQ is higher than STOP FREQ, the filter sweeps downwards.
Official Product Videos
Video: An official demonstration of the Electro-Harmonix Bass Micro Synthesizer pedal, showcasing its various sound capabilities and controls.
Video: A detailed overview and sound examples of the Electro-Harmonix Bass Micro Synthesizer XO Analog Synthesizer.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the pedal's exterior. Avoid abrasive cleaners or solvents.
- Power Supply: Always use the correct 9V DC (center-negative) power adapter to prevent damage.
- Storage: Store the pedal in a cool, dry environment away from direct sunlight and extreme temperatures.
- Connections: Periodically check all cable connections for wear and tear to ensure optimal performance.
Troubleshooting
- No Sound: Ensure the pedal is powered on, all cables are securely connected, and your instrument and amplifier are functioning correctly. Check the footswitch LED to confirm the effect is engaged.
- Weak or Distorted Sound: Verify the power supply is adequate. Check instrument cables for damage. Adjust the input sensitivity (TRIGGER) and output levels.
- Unexpected Synth Behavior: Experiment with the TRIGGER and RESONANCE sliders. The TRIGGER setting is crucial for consistent synth tracking. Ensure your bass's pickups are active and producing a strong, clean signal.
Specifications
| Item Weight | 1.84 pounds |
| Product Dimensions | 2.5 x 5.75 x 4.75 inches |
| Item Model Number | BASSMICRO |
| Body Material | Bass Wood |
| Color Name | Black, Green, White |
| Signal Format | Analog |
| Voltage | 4 Volts |
| Date First Available | December 17, 2008 |
Warranty and Support
Electro-Harmonix products are covered by a one-year warranty from the date of purchase against defects in materials or workmanship. For warranty service, repairs, or technical support, please contact Electro-Harmonix customer service directly or visit their official website for detailed contact information and service procedures.
Please retain your proof of purchase for warranty claims.