The FG-01 Flanger is a long discontinued pedal from the Pearl Sound Spice series, with a wide range of delay time (1.8ms-20ms), generating not only the typical flanging sound, but also chorus, phaser and short delay. It has four knobs: Speed, Depth, Manual and Feedback.
Operating instructions from the FG-01 Flanger user manual:
Manual: Used to select the frequencies to be given flanging effect. Turning clockwise selects high frequency range, and counterclockwise selects low frequency range. This control is also effective for modifying tone color.
Feedback: Used to emphasize the characteristic flanger sound. Turning clockwise heightens effect.
Depth: Adjusts the depth of flanging effect. Turning clockwise gives deeper and wider effects.
Speed: Adjusts the speed of flanging effect. Turning clockwise increases speed.
1. A setting for a natural flanging effect (effective with arpeggio or chord backing):
Manual: 8, Feedback: 5, Depth: 4, Speed: 3.
2. A setting for phasing:
Manual: 9, Feedback: 3.5, Depth: 2.5, Speed: 5.
3. A setting for chorus:
Manual: 5, Feedback: 0, Depth: 4, Speed: 4.
4. A setting for metallic sounds (e.g. ring modulator):
Manual: 6, Feedback: 10, Depth: 0, Speed: 1.
ICs, transistors and diodes used in the Pearl FG-01 Flanger:
CH-2 main circuit board:
SW-1 switching board: