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Boss SL-20 Slicer Guitar Effects Pedal  

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Inject a shot of high-octane fuel into your music with the Boss SL-20 Slicer Guitar Pedal. Instantly transform a guitar, bass, keyboard, or vocal into a pulsating groove instrument. Choose from 50 onb... Read More

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Inject a shot of high-octane fuel into your music with the Boss SL-20 Slicer Guitar Pedal. Instantly transform a guitar, bass, keyboard, or vocal into a pulsating groove instrument. 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.

Groove and Melody Maker

The SL-20 effect pedal 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 realtime 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.

  • 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)
  • Nominal Input Level: -20 dBu
  • Input Impedance: 1 Mohm
  • Nominal Output Level: -20 dBu
  • Output Impedance: 1 kohm
  • Recommended Load Impedance: m10 kohms or greater
  • Tempo: Quarter note 30 to 250 bpm
  • Maximum recording time: 40 sec.
  • Controls: START/STOP, REC, PLAY pedal, TAP pedal, EFFECT LEVEL knob, DIRECT LEVEL knob, BANK knob, PATTERN knob, ATTACK knob, DUTY knob, TEMPO knob, OUTPUT MODE button, PEDAL MODE button
  • Connectors: 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 adaptor jack
  • Power Supply: DC 9 V, Dry battery LR6/R6 (AA) type x 6/AC Adaptor (PSA-series: optional) *1
  • Current Draw: 110 mA
  • Accessories: Owner's Manual, Leaflets ("USING THE UNIT SAFELY," "IMPORTANT NOTES," and "Information"), Dry battery (R6 (AA) type (carbon) x 6) *2
  • Options: AC adaptor (PSA-series), Expression pedal (Roland EV-5, FV500L)
  • Size and Weight
  • Width: 173 mm (6-13/16 inches)
  • Depth: 158 mm (6-1/4 inches)
  • Height: 57 mm (2-1/4 inches)
  • Weight: 1.1 kg (2 lbs. 7 oz.) Including battery
  • * 0 dBu = 0.775 Vrms
  • *1 Expected battery life under continuous use: 7 hours (Carbon), 18 hours (Alkaline). These figures will vary depending on the actual conditions of use.
  • *2 The battery that was supplied with the unit is for temporary use-intended primarily for testing its operation. We also suggest replacing this with an alkaline dry cell.
  • *The specifications are subject to change without notice.
Boss pedals - 5 year parts warranty
90 day labor warranty.
1 year warranty - Multitracks, Jamstations, etc.
Check with manufacturer for specific product warranty.

Pro Coverage gives you added warranty protection for your new gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Read More.

Pro Coverage includes
  • Accidental damage protection (new gear only)
  • Expedited repair
  • Free shipping (for returns or repairs)
  • 100% coverage for commercial use
  • Extended return period
  • Extended price protection
  • No lemon guarantee
  • Free transfer of coverage to a new owner
  • Repair costs covered for up to three years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews

Review Snapshot®

by PowerReviews
BossSL-20 Slicer Guitar Effects Pedal

(based on 2 reviews)

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(3 of 3 customers found this review helpful)


You'll trip for hours...


from Philadelphia, PA

Comments about Boss SL-20 Slicer Guitar Effects Pedal:

The only pedal I've found that really nails the phase-inversion "out of speakers trick" that makes your stereo speakers sound like surround. A few high end "two speaker surround" products for home theater use this trick as well, and you've definitely heard it, along with lots of other stereo expansion tricks (Muse's Absolution, etc). To get this hallucinatory 3D effect you typically do a bunch of complicated phase inversion, EQ filtering, and panning automation in a DAW (obviously not something you are going to do live). This pedal does an AMAZING job of turning these 3D effects into a live performance tool... You can apply groove patterns to your source signal and have those patterns mixed with your dry signal in any combination via external expression pedal. The groove patterns will bounce left to right far beyond your actual speakers... You can even set them to swirl around your head 360 (all with just two well-positioned speakers). It is a functional pedal too... You can easily slave its tempo to another device via MIDI clock sync and apply it as final "stereo expansion mastering" after a clock synced looper, drum machine, etc. Seriously, invest a little time/cash in this pedal and a proper dual amp setup and you'll trip out for hours

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(7 of 11 customers found this review helpful)


Amazing Just keep your feet on the ground.


from Manteca, CA

Comments about Boss SL-20 Slicer Guitar Effects Pedal:

I bought this effects pedal not to long after it came out. Just trying to yet again broaden my possibilities. It worked not only does it sound amazing stand alone but if you mix it with lets say a DD-7 Digital delay set on analog with an e-bow resonating the Low E string dropped to a D then loop that within the slicer and just play a few chords over it to start off you'll like what you hear. I've been in guitar center many times every time before i bought this device i wowed people with what i was doing. So my only suggestion is to keep your feet on the ground because you're head will be floating in the clouds.

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