Boss SL-20 Slicer Audio Pattern Processor Pedal

Slicer Pedal for Guitar, Bass, Keyboards, or DJs with 40 Seconds of Record Time
Boss SL-20 Slicer Audio Pattern Processor Pedal image 1
Boss SL-20 Slicer Audio Pattern Processor Pedal image 1
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Boss SL-20 Slicer Audio Pattern Processor Pedal
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Tap Into New Sonic Possibilities with the SL-20

The BOSS SL-20 Slicer Guitar Pedal takes you beyond looping, giving you a truly creative tool that's sure to spark your playing. Guitarists, bassists, keyboardists, and DJs alike can reap the sonic benefits of the SL-20's unique abilities. Choose from 50 onboard Slice patterns or experiment with the SL-20's innovative Harmonic Slicer feature, which generates percussive melodies, loop record, and unique 3D panning. You get tap tempo functionality via an onboard pedal, and output modes that make the most of multiple-amp setups. Breathe new life into any instrument with the innovative and very cool SL-20!

BOSS SL-20 at a Glance:
  • Groove and melody maker
  • Flexible control
  • Universal FX

Groove and Melody Maker
The SL-20 transforms your music into percussive "chopped" grooves. Fifty rhythmic patterns are onboard, with adjustable note attack and duration, plus amazing Harmonic Slice effects. Create high-energy patterns onstage in real-time, or use the SL-20 as a songwriting and recording tool. Play the sliced sounds in real-time while capturing them with loop record.

Flexible Control
An internal tap-tempo feature is included, as well as the ability to sync to external MIDI clock. Sound characteristics of the SL-20 such as attack, duration, effect level, and direct level can be controlled by the onboard knobs or from an external expression pedal.

Universal FX
The SL-20 is an addictive effect that inspires creativity. It's great for guitarists, but it's equally useful for other instrumentalists as well. Plug in a bass, keyboard, iPod, or any other instrument or music-playback device. DJs and dance-music artists will also love the SL-20 as a rhythmic-performance tool.

BOSS SL-20 Features:
  • Instant groove and percussive-melody generator
  • 50 Slice patterns onboard, with adjustable attack and duration, including Harmonic Slice
  • Tap tempo via onboard pedal switch; internal and MIDI sync
  • Sound characteristics such as attack, duration, effect level, and direct level are controllable via external expression pedal (sold separately)
  • Variety of output modes, including 3D panning for spacious sliced FX
  • Maximum recording time: 40 sec.
  • Input jacks R/Mono, L (1/4 inch phone type)
  • Output jacks R/Mono, L (1/4 inch phone type)
  • Exp Pedal jack (1/4 inch TRS phone type)
  • MIDI In connector
  • AC adapter jack
Get creative with the SL-20 from BOSS!

Additional Media

BOSS SL-20 Owners Manual

Tech Specs

Pedal Type Slicer
Inputs 2 x Instrument
Outputs 2 x 1/4"
Batteries 6 x AA
Height 2.25"
Width 6.8"
Depth 6.25"
Weight 2.8 lbs.
Power Supply Included No
Manufacturer Part Number SL-20

Customer Reviews

Based on 5 reviews
Write your review

Sweet pedal

The Slicer is a really cool pedal. It is pretty simple and easy to create some interesting slice effects.
Music background: Maker of


Excelent service, it arrived sooner than expected and in perfect conditions. Thank you very much.
Music background: Guitarrist

Fun, Fun, Fun!!

This SL 20 pedal is very cool!. Retro color too! Check out video's on Youtube on this pedal. You won't be disappointed when u buy this pedal. Get it!
Music background: Hobbyist, Composer


I'm using this pedal with my prophet 08 and Moog 37. Awesome syncopation, especially with chord/pads. There's enough presets to keep one happy. If your a synthesist and your looking for a fun toy for some extra flavor, this may be for you, I'm having a blast with no regrets!

My New Secret Weapon!

Didn't really want to tell but I'm cool with Sweetwater so here"s the deal. This is a very cool pedal to have in your arsenal. I'm doing lots of electronic/techno based music and the Boss SL-20 is the coolest for arpeggios and tempo-sync EFX. The slice patterns are very useful and does that " hard gated tremolo like effect " when you turn down the direct level. Just got in Dec. and I have killer settings to use. I'm using a V-Wah with it and with some drive I can get some badd*** ring-modulation. If it stored settings in memory it would have gotten 10 stars! Thanks again S.W.! You always hook me up with the stuff I need!
Music background: Semi-pro musician, Guitars,Keys/Programming, Composition, Productions for 20+ years. Various styles of music.
See also: Loop Pedals, Boss, Boss Loopers, Boss DJ Effects