The Universal Audio Astra Modulation Machine is a Universal Audio chorus pedal, currently around $229. Close alternatives include the Empress Nebulus and the NuX Vibe Univibe. It pairs well with the Soldano SLO 100 100-Watt Tube Guitar Amplifier and the Fender Twin Reverb Head.

Universal Audio Astra Modulation Machine

Universal Audio · pedal

The Universal Audio UAFX Astra Modulation Machine is a multi-mode modulation pedal from Universal Audio (Santa Cruz, California), delivering chorus, flanger, vibrato, ensemble, and tremolo modes in one DSP-powered modulation platform modeled on classic vintage modulation hardware. The Astra Modulation Machine uses Universal Audio DSP-powered analog-modeling to deliver studio-quality multi-mode modulation pedal in a compact pedalboard format.

What stands out

  • “The Universal Audio UAFX Astra Modulation Machine is a multi-mode modulation pedal from Universal Audio (Santa Cruz, California), delivering chorus, flanger, vibrato, ensemble, and tremolo modes in one DSP-powered modulation platform modele…”

    — from the listing

  • “the astra modulation machine uses universal audio dsp-powered analog-modeling to deliver studio-quality multi-mode modulation pedal in a compact pedalboard format”

    — from the listing

  • “and tremolo modes in one dsp-powered modulation platform modeled on classic vintage modulation hardware”

    — from the listing

  • “Its standout strength is the multiple vintage-voiced modulation types including chorus, flanger, vibrato, ensemble, and tremolo in one UA DSP pedal at Universal Audio DSP quality”

    — from the community notes

  • “The UAFX Astra Modulation Machine delivers vintage-voiced modulation at Universal Audio quality for clean, indie, classic rock, and studio players who want studio-grade multi-mode modulation pedal from a respected professional audio manufac…”

    — from the community notes

Trade-offs

  • “In the signal chain modulation sits after drive”

    — from the community notes

  • chorus
  • studio
  • flanger
  • tremolo
  • vibrato
  • modulation
  • vintage
  • indie
$229View on Reverb

Price updated Oct 24, 2026

Genres the Universal Audio Astra Modulation Machine is commonly used in

  • Classic Rock
  • Indie
  • New Wave
    citedInferred from shared tonal signals, not a stated genre tag.
  • Ambient
    citedInferred from shared tonal signals, not a stated genre tag.
  • Post Punk
    citedInferred from shared tonal signals, not a stated genre tag.
  • Shoegaze
    citedInferred from shared tonal signals, not a stated genre tag.

Amps that pair well with the Universal Audio Astra Modulation Machine

Soldano SLO 100 100-Watt Tube Guitar Amplifier

Soldano

10% match
$5499.99via Reverb

Soldano SLO 100 100-Watt Tube Guitar Amplifier leans toward high gain, and that's a real, usable character to pair with

Comes later in the signal chain

Fender Twin Reverb Head

amplifier

10% match
$637.70via Reverb

Fender Twin Reverb Head leans toward dynamic, and that's a real, usable character to pair with

Comes later in the signal chain

Pedals that stack with the Universal Audio Astra Modulation Machine

Paul Cochrane Timmy

Paul Cochrane

8% match

Paul Cochrane Timmy leans toward transparent, and that's a real, usable character to pair with

Comes earlier in the signal chain

Electro-Harmonix Big Muff Pi

Electro-Harmonix

8% match
$74.89via Reverb

Electro-Harmonix Big Muff Pi's own fuzzy character is the real reason this is worth trying

Comes earlier in the signal chain

Old Blood Noise Endeavors Dark Star V3

Old Blood Noise Endeavors

6% match
$299via Reverb

Put Old Blood Noise Endeavors Dark Star V3 after Universal Audio Astra Modulation Machine in the signal chain, where it won't crowd Universal Audio Astra Modulation Machine — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Walrus Audio Bellwether Stereo Analog Delay

Walrus Audio

6% match

Put Walrus Audio Bellwether Stereo Analog Delay after Universal Audio Astra Modulation Machine in the signal chain, where it won't crowd Universal Audio Astra Modulation Machine — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Cheaper alternatives

Nobels MOD-mini

Nobels

76% similarity
$84.15via Reverb

Shared character: flanger, vibrato, chorus

TC Electronic Vortex Mini Flanger

TC Electronic

73% similarity
$87.18via Reverb

Shared character: flanger, vibrato, modulation

Source Audio Atlas

Source Audio

71% similarity
$199.95via Reverb

Shared character: flanger, vibrato, chorus

Universal Audio Uafx Brigade Chorus

Universal Audio

71% similarity
$28.28via Reverb

Shared character: vibrato, chorus, modulation

NuX Mod Core Deluxe MKII Modulation Effektpedal

Nux

66% similarity
$99via Reverb

Shared character: flanger, vibrato, chorus

Electro-Harmonix Neo Mistress Nano Flanger

Electro-Harmonix

64% similarity
$78.64via Reverb

Shared character: flanger, chorus, classic rock

Boutique & premium upgrades

T-Rex The Twister Chorus/Flanger

T Rex

70% similarity
$339.99via Reverb

Shared character: flanger, chorus, modulation

ThorpyFX The Camoflange Flanger MKII

ThorpyFX

55% similarity
$304.56via Reverb

Shared character: flanger, modulation, classic rock

Carl Martin TremO'vibe

Carl Martin

53% similarity
$380via Reverb

Shared character: vibrato, tremolo, modulation

Spaceman Aurora Analog Flanger Multi Mode Custom

Spaceman

92% similarity
$501.97via Reverb

similar tone character

Suhr Alexa Dual Channel Chorus/Vibrato

Suhr

91% similarity
$355via Reverb

similar tone character

Similar charactersee all similar tone character →

Empress Nebulus

Empress

60% similarity

Shared character: flanger, vibrato, chorus

NuX Vibe Univibe

Nux

56% similarity

Shared character: vibrato, chorus, modulation

Behringer The Flange

Behringer

92% similarity

similar tone character

Wren and Cuff Sonder

Wren And Cuff

92% similarity
$250via Reverb

similar tone character

JHS Emperor

JHS Pedals

91% similarity

similar tone character

Keeley Seafoam+

Keeley

91% similarity

similar tone character

See all alternatives to the Universal Audio Astra Modulation Machine (cheaper + boutique) →

Questions people ask

What are good alternatives to the Universal Audio Astra Modulation Machine?+

The closest matches in character are the Empress Nebulus, the NuX Vibe Univibe, the Behringer The Flange. Budget picks: Nobels MOD-mini, TC Electronic Vortex Mini Flanger, Source Audio Atlas. Boutique upgrades: T-Rex The Twister Chorus/Flanger, ThorpyFX The Camoflange Flanger MKII, Carl Martin TremO'vibe.

What pairs well with the Universal Audio Astra Modulation Machine?+

Strong matches from rig and tone-complementarity evidence: Soldano SLO 100 100-Watt Tube Guitar Amplifier, Fender Twin Reverb Head, Paul Cochrane Timmy — Soldano SLO 100 100-Watt Tube Guitar Amplifier leans toward high gain, and that's a real, usable character to pair with.

How much does the Universal Audio Astra Modulation Machine cost?+

Around $229 (live listing price, updated Oct 24, 2026).

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