The Old Blood Noise Endeavors BL-37 is an Old Blood Noise Endeavors reverb pedal, currently around $159. Close alternatives include the Hungry Robot The Borderland Modulated Ambient Reverb and the Hungry Robot The Borderland. It pairs well with the Matchless Lightning Reverb and the Vox AC30 Guitar Combo Amp.

Old Blood Noise Endeavors BL-37

Old Blood Noise Endeavors · pedal

The Old Blood Noise Endeavors BL-37 Reverb is a variable-clock reverb in the brand's BL series, adding modulation at two points in the reverb trail to create a wandering, lush, ever-shifting ambience with a simplified control set. Its signature feature is the Clock slider, which moves the sound from a quick, bright, tile-bathroom echo to a dark, lo-fi, time-stretched reverb, giving immediate, tactile control over fidelity and character. The dual modulation keeps the tails moving and organic rather than static, making it well suited to ambient, shoegaze, and experimental playing where evolving texture matters more than a clean room sound. It rewards keeping a thumb on the slider to morph the reverb in real time, offering a distinctive, characterful take on modulated reverb.

What stands out

  • “It rewards keeping a thumb on the slider to morph the reverb in real time, offering a distinctive, characterful take on modulated reverb”

    — from the listing

  • “It is used for ambient, shoegaze, and experimental textures, sitting at the end of the chain into clean amps, where sliding the clock takes it from bright, quick echoes to dark, stretched, lo-fi washes”

    — from the community notes

  • “Players love the BL-37 for lush, modulated reverb that wanders and evolves thanks to modulation at two points in the trail, with the Clock slider as the centerpiece for shaping fidelity”

    — from the community notes

  • “Its signature feature is the Clock slider, which moves the sound from a quick, bright, tile-bathroom echo to a dark, lo-fi, time-stretched reverb, giving immediate, tactile control over fidelity and character”

    — from the listing

  • “and experimental playing where evolving texture matters more than a clean room sound”

    — from the listing

Trade-offs

  • “natural room or hall reverb”

    — from the community notes

  • “the old blood noise endeavors bl-37 reverb is a variable-clock reverb in the brand”

    — from the listing

  • reverb
  • echo
  • bright
  • lush
  • ambient
  • dark
  • experimental
  • organic

Good for

  • Live
  • Studio
  • Worship
$159View on Reverb

Price updated Oct 22, 2026

Genres the Old Blood Noise Endeavors BL-37 is commonly used in

  • Ambient
  • Experimental
  • Shoegaze
  • Post Rock
    citedInferred from shared tonal signals, not a stated genre tag.
  • Lo Fi
    citedInferred from shared tonal signals, not a stated genre tag.
  • Electronic
    citedInferred from shared tonal signals, not a stated genre tag.

Amps that pair well with the Old Blood Noise Endeavors BL-37

Matchless Lightning Reverb

Matchless

29% match

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (dark → glassy)

Matchless Lightning Reverb leans glassy right where the dark tone needs it

Comes earlier in the signal chain

Vox AC30 Guitar Combo Amp

Vox

27% match
$799via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (dark → bright)

Where this leans dark, Vox AC30 Guitar Combo Amp answers back bright

Comes earlier in the signal chain

Gretsch 6160 Chet Atkins Amp

Gretsch

tonal match

Comes earlier in the signal chain

Gretsch 6160 Chet Atkins Amp's glassy balances out the dark tone

Matchless At 40 watts, the Laurel Canyon Reverb

Matchless

tonal match

Comes earlier in the signal chain

Matchless At 40 watts, the Laurel Canyon Reverb leans glassy right where the dark tone needs it

1964 Vox AC30

Vox

tonal match

Comes earlier in the signal chain

1964 Vox AC30 leans glassy right where the dark tone needs it

Vox MSB25 Mini SuperBeetle

Vox

tonal match
$378.97via Reverb

Comes earlier in the signal chain

Where this leans dark, Vox MSB25 Mini SuperBeetle answers back glassy

Diezel Paul 45W Head

Diezel

tonal match

Comes earlier in the signal chain

Diezel Paul 45W Head leans airy right where the dark tone needs it

Watkins Dominator

amplifier

tonal match

Comes earlier in the signal chain

Watkins Dominator's bright balances out the dark tone

Pedals that stack with the Old Blood Noise Endeavors BL-37

Wampler Latitude Deluxe Tremolo

Wampler

24% match
$169.95via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Put Wampler Latitude Deluxe Tremolo after Old Blood Noise Endeavors BL-37 in the signal chain, where it won't crowd Old Blood Noise Endeavors BL-37

Comes earlier in the signal chain

Singletone Malibu

Singletone

23% match
$299via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Keep Old Blood Noise Endeavors BL-37's bright voice out front: Singletone Malibu goes after Old Blood Noise Endeavors BL-37 in the signal chain so its spring voice doesn't muddy it

Comes earlier in the signal chain

Free The Tone ODL-1A-CS Overdriveland Custom w/Ch Cont

Free The Tone

21% match
$532.26via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (dark → glassy)

Free The Tone ODL-1A-CS Overdriveland Custom w/Ch Cont leans glassy right where the dark tone needs it

Comes earlier in the signal chain

Electronic Audio Experiments Surveyor V2.5

Electronic Audio Experiments

21% match

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (dark → bright)

Electronic Audio Experiments Surveyor V2.5's bright balances out the dark tone

Comes earlier in the signal chain

Carl Martin AC-Tone

Carl Martin

tonal match
$169via Reverb

Comes earlier in the signal chain

Carl Martin AC-Tone leans glassy right where the dark tone needs it

Strymon Iridium

Strymon

tonal match

Comes earlier in the signal chain

Run Strymon Iridium after it and the dark edge settles into something more glassy

Mooer Micro Preamp 004 Day Tripper

Mooer

tonal match
$81.47via Reverb

Comes earlier in the signal chain

Run Mooer Micro Preamp 004 Day Tripper after it and the dark edge settles into something more glassy

One Control Sonic Blue Twanger

One Control

tonal match
$105.49via Reverb

Comes earlier in the signal chain

Run One Control Sonic Blue Twanger after it and the dark edge settles into something more glassy

Cheaper alternatives

Walrus Audio Fundamental Ambient

Walrus Audio

59% similarity
$99.99via Reverb

Shared character: experimental textures, dark, brand

Boutique & premium upgrades

Walrus Audio Slöer Stereo Reverb

Walrus Audio

53% similarity
$349.99via Reverb

Shared character: dark, ambient, reverb

Alexander Golden Summer Reverb

Alexander Pedals

52% similarity
$268.40via Reverb

Shared character: ambient, bright, modulation

Death By Audio Dream Station

Death By Audio

52% similarity
$250via Reverb

Shared character: modulation, reverb

Old Blood Noise Endeavors Procession V2

Old Blood Noise Endeavors

48% similarity
$209via Reverb

Shared character: dark, noise, ambient

Death By Audio Reverberation Machine

Death By Audio

47% similarity
$225via Reverb

Shared character: dark, bright, reverb

Strymon Cloudburst

Strymon

47% similarity
$279via Reverb

Shared character: ambient, modulation, reverb

Similar charactersee all similar tone character →

Hungry Robot The Borderland Modulated Ambient Reverb

Hungry Robot

59% similarity

Shared character: ambient, modulation, reverb

Hungry Robot The Borderland

Hungry Robot

55% similarity

Shared character: ambient, modulation, reverb

EarthQuaker Devices Afterneath V2

EarthQuaker Devices

52% similarity

Shared character: ambient, reverb

Old Blood Noise Endeavors Dark Star V3

Old Blood Noise Endeavors

49% similarity

Shared character: dark, noise, ambient

Alexander Pedals SpaceXpander

Alexander Pedals

48% similarity
$189.99via Reverb

Shared character: dark, ambient, bright

Laney Secret Path

Laney

47% similarity
$150.15via Reverb

Shared character: dark, ambient, bright

See all alternatives to the Old Blood Noise Endeavors BL-37 (cheaper + boutique) →

Questions people ask

What are good alternatives to the Old Blood Noise Endeavors BL-37?+

The closest matches in character are the Hungry Robot The Borderland Modulated Ambient Reverb, the Hungry Robot The Borderland, the EarthQuaker Devices Afterneath V2. Budget picks: Walrus Audio Fundamental Ambient. Boutique upgrades: Walrus Audio Slöer Stereo Reverb, Alexander Golden Summer Reverb, Death By Audio Dream Station.

What pairs well with the Old Blood Noise Endeavors BL-37?+

Strong matches from rig and tone-complementarity evidence: Matchless Lightning Reverb, Vox AC30 Guitar Combo Amp, Gretsch 6160 Chet Atkins Amp — Matchless Lightning Reverb leans glassy right where the dark tone needs it.

How much does the Old Blood Noise Endeavors BL-37 cost?+

Around $159 (live listing price, updated Oct 22, 2026).

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