The Universal Audio Astra Modulation Machine is a Universal Audio chorus pedal, currently around $250. Close alternatives include the Source Audio Atlas and the Fairfield Circuitry Shallow Water, K-Field Modulator. It pairs well with the Park P50 Classic and the Milkman Sound Creamer 20W Combo.
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.
- modulation
- flanger
- chorus
- tremolo
- vibrato
- vintage
- overdrive
- indie
Price updated Aug 24, 2026
Genres the Universal Audio Astra Modulation Machine is commonly used in
- Classic Rock
- Indie
- New Wave
cited
Inferred from shared tonal signals, not a stated genre tag. - Ambient
cited
Inferred from shared tonal signals, not a stated genre tag. - Shoegaze
cited
Inferred from shared tonal signals, not a stated genre tag. - Post Punk
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Universal Audio Astra Modulation Machine
Park P50 Classic
Park
9% matchWhat Park P50 Classic brings here leans toward compressed — that's worth building a pairing around
Milkman Sound Creamer 20W Combo
Milkman Sound
9% matchMilkman Sound Creamer 20W Combo leans toward edge of breakup, and that's a real, usable character to pair with
Pedals that stack with the Universal Audio Astra Modulation Machine
Walrus Audio EB-10
Walrus Audio
7% matchWhat Universal Audio Astra Modulation Machine brings here leans toward modulated — that's worth building a pairing around
Xotic RC Booster
Xotic
7% matchWhat Xotic RC Booster brings here leans toward transparent — that's worth building a pairing around
Crazy Tube Circuits Splash MKIV Reverb
Crazy Tube Circuits
6% matchKeep Crazy Tube Circuits Splash MKIV Reverb after Universal Audio Astra Modulation Machine in the signal chain, clear of Universal Audio Astra Modulation Machine's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Crazy Tube Circuits White Whale
Crazy Tube Circuits
6% matchCrazy Tube Circuits White Whale's spring voice goes after Universal Audio Astra Modulation Machine in the signal chain — it's not there to compete with Universal Audio Astra Modulation Machine's own modulated character — goes in the amp's FX loop (or last, into a clean amp)
Cheaper alternatives
Nobels MOD-mini
Nobels
75% similarityShared character: flanger, vibrato, chorus
TC Electronic Vortex Mini Flanger
TC Electronic
69% similarityShared character: flanger, vibrato, modulation
Boffin FX Vibratron
Boffin Fx
94% similaritysimilar tone character
Dreadbox Komorebi
Dreadbox
94% similaritysimilar tone character
NuX Mod Core Deluxe MKII Modulation Effektpedal
Nux
94% similaritysimilar tone character
Carl Martin Atlantic Chorus
Carl Martin
93% similaritysimilar tone character
Boutique & premium upgrades
Similar charactersee all similar tone character →
Source Audio Atlas
Source Audio
70% similarityShared character: flanger, vibrato, chorus
Fairfield Circuitry Shallow Water, K-Field Modulator
Fairfield Circuitry
69% similarityShared character: vibrato, chorus, tremolo
SolidGoldFX Oblivion Quad Flange
Solidgoldfx
69% similarityShared character: flanger, chorus, analog
EBS Red twister
Ebs
68% similarityShared character: flanger, vibrato, chorus
Source Audio Mercury Flanger
Source Audio
68% similarityShared character: flanger, chorus, overdrive
Bookworm Effects Laughing Man Optical Tremolo V3
Bookworm Effects
68% similarityShared character: vibrato, tremolo, modulation
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 Source Audio Atlas, the Fairfield Circuitry Shallow Water, K-Field Modulator, the SolidGoldFX Oblivion Quad Flange. Budget picks: Nobels MOD-mini, TC Electronic Vortex Mini Flanger, Boffin FX Vibratron. Boutique upgrades: Carl Martin TremO'vibe, Fairfield Circuitry Shallow Water.
What pairs well with the Universal Audio Astra Modulation Machine?+
Strong matches from rig and tone-complementarity evidence: Park P50 Classic, Milkman Sound Creamer 20W Combo, Walrus Audio EB-10 — What Park P50 Classic brings here leans toward compressed — that's worth building a pairing around.
How much does the Universal Audio Astra Modulation Machine cost?+
Around $250 (live listing price, updated Aug 24, 2026).