Introduction
This manual provides comprehensive instructions for the FLAMMA FV04 Harmony and FV02 Doubling Vocal Pedals. These pedals are designed to enhance vocal and guitar performances with advanced harmony, doubling, and reverb effects. Please read this manual thoroughly to ensure proper setup, operation, and maintenance of your pedals.
Product Overview
The FLAMMA Harmony and Doubling Vocal Pedals bundle includes two distinct units: the FV04 Harmony Pedal and the FV02 Doubling Pedal. Each pedal offers unique functionalities to enrich your sound.

Image: The FLAMMA FV04 Harmony Pedal (blue) and FV02 Doubling Pedal (green) shown together.
FV04 Harmony Pedal
The FV04 Harmony Pedal is designed to add rich vocal harmonies to your performance. It features 11 different harmony modes and can comfortably shift between major and minor scales for ultimate pitch flexibility. It accepts both guitar and microphone inputs and includes dedicated reverb effects for each.

Image: Close-up of the FV04 Harmony Pedal, highlighting its 12 available pitches and 11 different harmony modes.

Image: The FV04 Harmony Pedal depicted in three common usage scenarios: live performance, guitar accompanied by vocals, and music recording.
FV02 Doubling Pedal
The FV02 Doubling Pedal is designed to create a thicker, more robust vocal sound by duplicating your voice. It supports multiple vocal modes and includes reverb and chorus effects. This pedal is ideal for vocalists and guitarists looking to add depth and presence to their sound.

Image: Front view of the FLAMMA FV02 Doubling Pedal, showing its control knobs and footswitch.

Image: Side view of the FLAMMA FV02 Doubling Pedal, illustrating the different doubling modes available: Unison, Oct-, Oct+, Group1, and Group2.
Setup
Follow these steps to set up your FLAMMA vocal pedals:
- Power Connection: Connect a 9V DC, 500mA power adapter (center negative) to the "DC IN" jack on the rear panel of each pedal.
- Microphone Input: Connect your microphone to the "MIC" XLR input. If your microphone requires phantom power, ensure the 48V switch is engaged.
- Guitar Input: Connect your guitar to the "GUITAR IN" 1/4" jack.
- Audio Output: Connect the "XLR OUT" to your mixer or audio interface. For separate guitar output, use the "GUITAR OUT" 1/4" jack.
- Ground Lift: If you experience hum or noise, try engaging the "GND LIFT" switch to break ground loops.

Image: Rear panel of the FV02 Doubling Pedal, showing the DC IN, MIC XLR input, 48V phantom power switch, XLR OUT, GND LIFT switch, LINE IN, and GAIN controls. The FV04 has similar connectivity for vocal processing.
Operating Instructions
FV04 Harmony Pedal Operation
The FV04 Harmony Pedal allows you to add various vocal harmonies to your performance. Familiarize yourself with its controls:
- MODE Knob: Selects one of the 11 harmony modes.
- KEY Knob: Sets the musical key for the harmonies.
- LEVEL Knob: Adjusts the overall output level of the pedal.
- SHARP R:OFF B:ON Switch: Toggles between sharp (blue LED) and off (red LED) modes for key adjustments.
- Footswitch: Engages or bypasses the harmony effect.
Harmony Modes:

Image: A table detailing the 11 harmony modes available on the FV04 Harmony Pedal, including OCT-, OCT+, 5th L, 3rd L, 5th H, 3rd H, OCT- & OCT+, 5th L & 3rd H, 5th H & 3rd L, 3rd L & 3rd H, and 3rd H & 5th H.
To use, select your desired harmony mode and key, then adjust the level. The pedal will automatically generate harmonies based on your input.
FV02 Doubling Pedal Operation
The FV02 Doubling Pedal creates a rich, layered vocal sound. Understand its controls for optimal use:
- MODE Knob: Selects one of the 5 doubling modes (Unison, 2.Oct-, 3.Oct+, 4.Group1, 5.Group2).
- REVERB Knob: Adjusts the amount of reverb effect.
- LEVEL Knob: Controls the overall output level of the pedal.
- TONE Switch: Cycles through WARM, BRIGHT, and NORMAL EQ modes, affecting the tonal character of your vocal.
- RM/HL Switch: Toggles between Reverb Mix and Hall reverb types.
- Footswitch: Engages or bypasses the doubling effect.
Select a doubling mode and adjust the reverb and level to achieve your desired vocal thickness. Experiment with the TONE switch to find the best EQ setting for your voice.
Maintenance
To ensure the longevity and optimal performance of your FLAMMA vocal pedals, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the pedals. Avoid using abrasive cleaners, solvents, or waxes.
- Storage: Store the pedals in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity when not in use.
- Power Off: Always disconnect the power adapter when the pedals are not in use for extended periods.
- Handle with Care: Avoid dropping the pedals or subjecting them to strong impacts.
Troubleshooting
If you encounter issues with your FLAMMA vocal pedals, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound output | Incorrect cable connections, pedal bypassed, power issue. | Check all audio cables and power supply. Ensure the pedal is engaged (footswitch LED is on). Verify microphone is powered (48V if needed). |
| Distorted or noisy sound | Input/output levels too high, ground loop, faulty cable. | Adjust input/output levels. Engage the GND LIFT switch. Try different cables. |
| Harmony/Doubling not working | Incorrect mode/key settings, low input signal. | For FV04, check MODE and KEY settings. For FV02, check MODE setting. Ensure microphone/guitar signal is strong enough. |
| Pedal does not power on | Incorrect power adapter, faulty power outlet. | Ensure you are using a 9V DC, 500mA (center negative) power adapter. Test the power outlet with another device. |
Specifications
| Feature | Description |
|---|---|
| Brand | FLAMMA |
| Model | FV04 Harmony Pedal, FV02 Doubling Pedal |
| Signal Format | Analog |
| Style | Compact |
| Controls Type | Knob |
| Power Requirement | 9V DC, 500mA (Center Negative) |
| Inputs | MIC (XLR), GUITAR IN (1/4" Jack) |
| Outputs | XLR OUT, GUITAR OUT (1/4" Jack) |
Warranty and Support
FLAMMA products are designed for reliability and performance. This product is covered by a standard manufacturer's warranty against defects in materials and workmanship. Please refer to the warranty card included in your product packaging for specific terms and conditions.
For technical support, troubleshooting assistance, or warranty claims, please contact FLAMMA customer service through their official website or the retailer where you purchased the product. Keep your proof of purchase for warranty validation.
Online Resources:
- FLAMMA Official Website: www.flamma.com (Note: This is a placeholder URL as no specific support URL was provided in the data.)





