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Boss effects pedal Boss is a manufacturer of effects pedals for electric guitar and bass guitar. It is a division of the Roland Corporation, a Japanese manufacturer that specializes in musical equipment and accessories. For many years Boss manufactured a range of products related to effects processing for guitars, including compact and twin effects pedals, multi-effect pedals, electronic tuners, and pedal boards. In more recent times, Boss expanded their products line to include Digital Studios, rhythm machines and other electronic equipment.

The earliest Boss product was called B-100 The Boss, released in 1976. This came with a clip-on pre-amp and a pickup to amplify acoustic guitars. At this point the Boss company had not been formed and it was still technically a Roland product.

The first proper Boss foot pedal effect, in 1976, was called the CE-1 Chorus Ensemble, believed by many guitarists to be the Holy Grail of pedal chorus effects. It was a fairly large, AC-powered unit. It was popular with artists at the time such as Andy Summers and can be heard on various recordings.

Boss's line of compact pedals began in 1977 with the release of three pedals: an overdrive pedal (OD-1), a phaser pedal (PH-1) and a parametric equalizer called the Spectrum (SP-1). The Boss DS-1 was released the next year, in 1978. Also released in this year is the T Wah (TW-1) pedal. Their first compact chorus pedal (CE-2) came the next year (1979), and their first flanger pedal (BF-2) in 1980. In 1983 Boss released the DD-2 Digital Delay, the first mass-produced digital delay in a compact pedal format. In 1987 Boss released nine new pedals, including the Turbo Distortion (DS-2). The Metal Zone (MT-2) was released in 1991. The Heavy Metal (HM-2) distortion pedal was an integral part of the guitar sound of many styles of heavy metal music ever since. The pedals all share the same 'footprint', for compatibility with pedal boards.

Boss introduced COSM (Composite Object Sound Modeling), Roland's proprietary version of digital modeling technology, into their AC-3 Acoustic Simulator pedal in 2006. Boss has since released several pedals using COSM, including the FBM-1 '59 Fender Bassman pedal and FDR-1 '65 Fender Deluxe Reverb pedal, introduced at the Winter NAMM show in January 2007.

All Boss compact pedals use a "buffered bypass" type of silent foot switching utilizing Field Effect Transistors (FETs) to avoid clicks and pops. While not "true" bypass, the buffered bypass has the advantage of preventing signal loss due to long runs of cable, while keeping original guitar tone intact.

Acoustic Simulator AC-2
Auto Wah AW-2
Bass Chorus CE-2B
Bass Equalizer GE-7B (GEB-7)
Bass Flanger BF-2B
Bass Limiter LM-2B
Bass Overdrive ODB-3
Blues Driver BD-2
Chorus Ensemble CE-1
Chorus Ensemble CE-2
Chorus Ensemble CE-3
Chorus Ensemble CE-5
Compressor Sustainer CS-1
Compressor Sustainer CS-2
Compressor Sustainer CS-3
Delay DM-2
Delay DM-3
Digital Delay DD-2
Digital Delay DD-3
Digital Delay DD-5
Digital Delay DD-6
Digital Delay DD-7
Digital Dimension DC-2
Digital Metalizer MZ-2
Digital Reverb RV-2
Digital Reverb RV-5
Digital Reverb/Delay RV-3
Digital Sampler/Delay DSD-2
Digital Space DC-3/Digital Dimension DC-3
Digital Stereo Reverb RV-70
Distortion DS-1
Dr. Rhythm DR-55
Dual Overdrive SD-2
Dynamic Filter FT-2
Dynamic Wah AW-3
Enhancer EH-2
Flanger BF-1
Flanger BF-2
Flanger BF-3
Foot Wah FW-3
Graphic Equalizer GE-6
Graphic Equalizer GE-7
Graphic Equalizer GE-10
Harmonist HR-2
Harmonist PS-6
Heavy Metal HM-2
Hyper Metal HM-3
Limiter LM-2
Line Selector LS-2
Loop Station RC-2
Mega Distortion MD-2
Metal Zone MT-2
Multi Effects ME-5
Multi Effects ME-6
Multi Effects ME-8
Multi Effects ME-30
Multi Effects ME-50
Noise Gate NF-1
Noise Suppressor NS-2
Octaver OC-2/Octave OC-2
Overdrive OD-1
Overdrive OD-3
Parametric Equalizer PQ-4
Phaser PH-1
Paser PH-1R
Pitch Shifter/Delay PS-2
Power Stack ST-2
Reverb Box RX-100
Rocker Distortion PD-1
Rocker Volume PV-1
Rocker Wah PW-1
Slow Gear SG-1
Spectrum Sp-1
Super Chorus CH-1
Super Distortion & Feedbacker DF-2
Super Overdrive SD-1
Super Phaser PH-2
Super Shifter PS-5
Touch Wah TW-1/ T Wah TW-1
Tremolo TR-2
Tremolo/Pan PN-2
Turbo Distortion DS-2
Turbo Overdrive OD-2
Vibrato VB-2
Volume FV-50H
Volume FV-50L
Volume Pedal FV-100