Evolved from our flagship Astra Modulation Machine, Flow Vintage Tremolo offers you three styles of tube-driven wobble and shake — from classic to modern — in a stylish, compact design.

• Experience three stunning emulations of legendary tube amp tremolo effects, from opto to harmonic
• Explore rich, authentic tones and effects with a perfectly emulated tube preamp section
• Sync your tremolo with tap tempo and add boost effects using the Volume control
• Count on timeless UA craftsmanship, built for years of reliable performance

Dharma: Experience Thick Harmonic Tremolo
Immerse yourself in the rich pulse of early '60s American "brown" amps, adding a smooth blend of volume fluctuation and phase shifting — far beyond the original circuit — perfect for vintage soul, surf, and even Uni-Vibe textures.*

65: Enjoy Perfect Tube Amp Tremolo
Play through a detailed end-to-end emulation of a classic 1965 American tube amp’s optical tremolo circuit, capturing the pulsating shimmer of the most famous "vibrato" ever created. Sounds just like your favorite vintage record.

Square: Add Modern, Choppy Textures
Built from the ground up using our own virtual optical photocell, experience the rippling beauty of square waveforms and dive into rhythmic tremolo effects that enhance any genre, from modern pop and R&B to blues and indie rock.

Get the Authentic Tone of a Tube Preamp
Flow delivers the warm, complex sounds of a tube preamp — specifically from early and mid-'60s American combos — making your tremolo effects more present, three-dimensional, and musical.

Paint the Town with a Rugged, Compact Stompbox
Built for years of dependable use, Flow Vintage Tremolo features switchable true/trails bypass, tap tempo, and "make up gain" Volume control to ensure your tremolo effects are heard loud and clear for years to come.

Features

Authentic emulations of three tube-driven tremolo effects, captured in a compact stompbox

Perfectly captured tube preamp for rich, three-dimensional tremolo tones

Three tremolo modes: Dharma (harmonic tremolo), 65 (smooth sine wave), and Square (choppier, square wave)

Onboard tap tempo for syncing tremolo effects

Volume control and true/buffered bypass

Timeless UA design and craftsmanship, built for decades of reliable performance