Boss CS-3 Compression Sustainer Pedal

Compression/Sustainer Pedal for Guitar
Boss CS-3 Compression Sustainer Pedal image 1
Boss CS-3 Compression Sustainer Pedal image 1
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Boss CS-3 Compression Sustainer Pedal
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A Wealth of Great Compression From One Pedal!

Enhanced sustain, tight control of dynamics, fatter sound. . . all from one pedal! It's right here at Sweetwater, the CS-3 Compression Sustainer effects pedal! The CS-3 gives you smooth sustain without degrading the quality of the original sound. A range of effects from gentle compression to squeezed sounds is at your command. Designed for outstanding low-noise performance, the CS-3 also provides EQ for precise sonic control.

Additional Media

Read the Boss CS-3 Owner's Manual
How To Get the Most From Your Compressor Pedal: Part 2
BOSS CS-3 Compression Sustainer Pedal Review by Sweetwater

Tech Specs

Pedal Type Compressor
Inputs 1 x Instrument
Outputs 1 x 1/4"
Batteries 1 x 9V
Height 2.4"
Width 2.9"
Depth 5.1"
Weight 1 lb.
Power Supply Included No
Manufacturer Part Number CS-3

Customer Reviews

Based on 20 reviews
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Very Underrated, Great for THAT Sound

The CS-3 is a fantastic compressor and a classic. It unfortunately seems to get some negative reviews which it really doesn't deserve - it does a specific sound and does it well. I currently own the Diamond Comp and JHS Pulp n Peel. Both are amazing and definitely do things the CS-3 can't, but neither comes close to the CS-3 for fat, chimey arpeggios and twangy leads. Darker compressors like the Keeley and the Dyna Comp can get lost in a mix (though both are fantastic.) The CS-3 can be dialed in to be darker, but it really excels at cutting through a dense mix. Overall a great comp and the best in this price range for sure.
Music background: Gigging Guitarist

just what i was looking for

this is a great pedal, it will take me awhile to learn how to make it sound the way I want it to but it's great

Highly Versatile

When I started using my Boss Compression/Sustainer pedal (and after some knob tweaking) I couldn't believe how versatile and useful it is. Makes me wonder how I ever got by without one. Excellent product from Boss as always.
Music background: Blues/rock

CS-3 Compression Sustainer

Great Pedal for Blues & R&B.I use mine with a American Standard Strat thru Fender Twin tube and Peavey Solidstate Trans Tube pratice amp.Good Tone. Great Sustain.
Music background: Blues,Gospel R&B


I’ve recently started using and learning this Boss CS-3 Compresssion Sustainer Pedal with an Ovation Custom Legend and a Fender Acoustasonic amp. I’m trying this pedal in church music for “singing out” and sustain in my melodic lines, as well as for variety in the sound of my chording. It’s been more than adequate, although an imaginary “infinite sustain” does not occur, of course—and is not claimed to occur—while yet one can dream and eke out sweet spots. No matter: the sustain and the volume increase capabilities of the pedal are really helpful. And the pedal generally is excellent in its response and dialings, though the settings with this equipment remain elusive. That is, it’s difficult to adjust the guitar preamp, the amp, and the pedal for desired and sometimes realized effects. As far as the chording: there is a ‘moment of setting’ with this pedal and equipment that is truly marvelous. There is a scintillating evenness that brings forth so many hidden notes and nuances that it is as though you are playing a different instrument. At the that moment you produce a rich candy shower of variegated ethereality. 'Nuff said?
See also: EQ Pedals, Boss, Boss Compressors and EQ