The Keeley KO-Als Distortion is a Keeley distortion pedal, currently around $170. Close alternatives include the Mad Professor Mad-Rbo and the Cusack Music Orthrus Distortion. It pairs well with the Marshall Silver Jubilee 25/55 100W Amp Head and the Friedman Dirty Shirley.
Keeley KO-Als Distortion
Keeley · pedal
The Keeley KO-ALS is a limited-edition distortion pedal, hand-built in a run of just 100 units, based on the Keeley Stahlhammer circuit, with proceeds from its sale benefiting Project ALS in support of ALS (Lou Gehrig's Disease) research. It offers Distortion, Level, Bass, Mids, and Treble controls for finely shaping heavy distortion tones, plus a side-mounted switch selecting between Fender- and Marshall-style EQ contours, letting players tailor the pedal's underlying amp-voicing character.
What stands out
“It offers Distortion, Level, Bass, Mids, and Treble controls for finely shaping heavy distortion tones, plus a side-mounted switch selecting between Fender- and Marshall-style EQ contours, letting players tailor the pedal's underlying amp-v…”
— from the listing
“Primary use case is players wanting high-gain distortion with genuine EQ precision”
— from the community notes
“The Keeley KO-ALS is a limited-edition distortion pedal, hand-built in a run of just 100 units, based on the Keeley Stahlhammer circuit, with proceeds from its sale benefiting Project ALS in support of ALS (Lou Gehrig's Disease) research”
— from the listing
“Based on the Stahlhammer circuit, a well-regarded Keeley high-gain design, giving it genuine tonal pedigree”
— from the reviews
“Full Bass/Mids/Treble EQ section offers real precision for shaping heavy distortion, more control than many single-knob distortion pedals provide”
— from the reviews
Trade-offs
“s fundamental amp-character reference point”
— from the community notes
“and as a rare charitable release supporting als research with a strictly”
— from the community notes
- distortion
- high gain
- treble
- mids
- bass
- eq
- full
Price updated Oct 24, 2026
Genres the Keeley KO-Als Distortion is commonly used in
- Electronic
- Metal
cited
Inferred from shared tonal signals, not a stated genre tag. - Hard Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Alternative
cited
Inferred from shared tonal signals, not a stated genre tag. - Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Punk
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Keeley KO-Als Distortion
Marshall Silver Jubilee 25/55 100W Amp Head
amplifier
27% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → warm)
Marshall Silver Jubilee 25/55 100W Amp Head's warm balances out the bright tone
Comes later in the signal chain
Friedman Dirty Shirley
Friedman
26% matchgain stackingStacks two gain stages for more saturation than either produces alone. (mid-forward → high gain)
Run mid-forward into Friedman Dirty Shirley for more high gain on top
Comes later in the signal chain
Fender Dual Showman
amplifier
tonal matchComes later in the signal chain
Fender Dual Showman pushes a high gain tone toward tight
Orange Little Bass Thing
Orange
tonal matchComes later in the signal chain
Where this leans bright, Orange Little Bass Thing answers back warm
Mesa Boogie Mark VII 1x12 Combo
Mesa Boogie
tonal matchComes later in the signal chain
Put Mesa Boogie Mark VII 1x12 Combo in front and the mid-forward tone leans further toward high gain
Mesa Boogie Mark VII Rackmount Head
Mesa Boogie
tonal matchComes later in the signal chain
Mesa Boogie Mark VII Rackmount Head stacks high gain on top of the mid-forward already here
Mesa Boogie Mark Five:25 Head
Mesa Boogie
tonal matchComes later in the signal chain
Put Mesa Boogie Mark Five:25 Head in front and the mid-forward tone leans further toward high gain
Revv Generator 120 MkIII 10th Anniversary 4-Channel 120W Head
Revv
tonal matchComes later in the signal chain
Stack Revv Generator 120 MkIII 10th Anniversary 4-Channel 120W Head on top and a high gain tone tightens toward tight
Pedals that stack with the Keeley KO-Als Distortion
Boss CE-2W Chorus Waza Craft
Boss
15% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Keep Keeley KO-Als Distortion's high gain voice out front: Boss CE-2W Chorus Waza Craft goes after Keeley KO-Als Distortion in the signal chain so its modulated voice doesn't muddy it
Comes later in the signal chain
Fjord Fuzz Fjaer Spring Reverb
Fjord Fuzz
14% matchgain stackingStacks two gain stages for more saturation than either produces alone. (mid-forward → fuzzy)
Fjord Fuzz Fjaer Spring Reverb stacks fuzzy on top of the mid-forward already here
Comes later in the signal chain
Greer Black Mountain
Greer
12% matchgain stackingStacks two gain stages for more saturation than either produces alone. (mid-forward → fuzzy)
Greer Black Mountain layers fuzzy onto an already mid-forward signal
Suhr Discovery
Suhr
12% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Keep Keeley KO-Als Distortion's high gain voice out front: Suhr Discovery goes after Keeley KO-Als Distortion in the signal chain so its warm voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
J. Rockett Clockwork Echo
J Rockett
11% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (high gain → modulated)
Keep J. Rockett Clockwork Echo after Keeley KO-Als Distortion in the signal chain, clear of Keeley KO-Als Distortion's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Pigtronix Gloamer Volume Swell
Pigtronix
11% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → smooth)
Pigtronix Gloamer Volume Swell's own smooth character is the real reason this is worth trying
Comes earlier in the signal chain
Anarchy Audio Flutterby Tremolo
Anarchy Audio
tonal matchComes later in the signal chain
Anarchy Audio Flutterby Tremolo goes after Keeley KO-Als Distortion — modulation sits after the gain for a defined swirl
Matthews Effects The Pocket Drive Overdrive Boost
Matthews Effects
tonal matchComes earlier in the signal chain
Matthews Effects The Pocket Drive Overdrive Boost pushes a high gain tone toward clean boost
Cheaper alternatives
Caline CP-15
Caline
56% similarityShared character: treble, bass, distortion
DigiTech Metal Master
Digitech
53% similarityShared character: treble, bass, distortion
MXR Super Badass Distortion
MXR
52% similarityShared character: treble, bass, distortion
Caline CP-12 Blue Pure Sky
Caline
52% similarityShared character: treble, bass, high gain settings
Canvas Analog Devices The Raven Distortion
Canvas Analog Devices
50% similarityShared character: distortion, high gain settings
Tone City Model S Distortion
Tone City
48% similarityShared character: distortion, high gain settings
Boutique & premium upgrades
Electronic Audio Experiments Longsword Eastside Exclusive Mono Camo
Electronic Audio Experiments
49% similarityShared character: treble, bass, distortion
Fuzzrocious Baxtabber
Fuzzrocious
47% similarityShared character: treble, bass
Xotic EP-Pro
Xotic
91% similaritysimilar tone character
Similar charactersee all similar tone character →
Mad Professor Mad-Rbo
Mad Professor
61% similarityShared character: treble, bass, distortion
Cusack Music Orthrus Distortion
Cusack Music
59% similarityShared character: treble, bass, distortion
Friedman Small Box Overdrive
Friedman
56% similarityShared character: treble, bass, full
Airis Effects -Nemesis Preamp
Airis Effects
54% similarityShared character: treble, bass, distortion
Bogner Wessex V2
Bogner
51% similarityShared character: treble, bass, distortion
EarthQuaker Devices Tone Job
EarthQuaker Devices
48% similarityShared character: treble, bass
See all alternatives to the Keeley KO-Als Distortion (cheaper + boutique) →
Questions people ask
What are good alternatives to the Keeley KO-Als Distortion?+
The closest matches in character are the Mad Professor Mad-Rbo, the Cusack Music Orthrus Distortion, the Friedman Small Box Overdrive. Budget picks: Caline CP-15, DigiTech Metal Master, MXR Super Badass Distortion. Boutique upgrades: Electronic Audio Experiments Longsword Eastside Exclusive Mono Camo, Fuzzrocious Baxtabber, Xotic EP-Pro.
What pairs well with the Keeley KO-Als Distortion?+
Strong matches from rig and tone-complementarity evidence: Marshall Silver Jubilee 25/55 100W Amp Head, Friedman Dirty Shirley, Fender Dual Showman — Marshall Silver Jubilee 25/55 100W Amp Head's warm balances out the bright tone.
How much does the Keeley KO-Als Distortion cost?+
Around $170 (live listing price, updated Oct 24, 2026).