SmallStorm Phase Shifter

SmallStorm effect is inspired by the classic analog warmth of the SmallStone® pedal effect from EHX™, produced in the ’70s.
SmallStorm phase shifter effect combines original and new features for enhanced control and flexibility in your audio production.

SmallStorm Phaser emulates all 8 hardware versions of the classic EHX™ Small Stone® pedal.
Users can select any model: from USA versions V1–V4 (including the Nano V5) to the Soviet-era Sovtek™ V1 and Russian versions V2–V3, or switch to the Custom mode with full access to advanced parameters for deep control of the phaser engine

This is a 4-pole phase shifter, known for its smooth and lush phase-shifting sound. Its distinctive swooshing tones provide you with a classic and sought-after effect for achieving rich modulation.

With the added convenience of digital processing, we’ve incorporated new features to enhance your sonic possibilities. We include main modifications available for the original pedal effect, and add some very usable features.

The LFO Sync feature allows you to synchronize the modulation rate to your project’s tempo. This ensures that the phasing effect stays in sync with the rhythm of your music, providing rhythmic precision and creative possibilities.

Control the intensity of the phasing effect with the effect Depth parameter. From subtle modulation to more pronounced sweeps, tailor the depth to suit your musical context.

The Spread control widens the stereo image of the phaser, creating a more expansive and immersive sound. Experiment with different Spread settings to add dimension to your tracks.

The Boost feature adds a touch of gain to the signal, allowing you to boost the phaser effect for added presence and impact. Use it to cut through the mix or for creating dynamic tonal shifts.

Find the perfect balance between the dry and wet signals with the Mix control. From subtle background modulation to intense phasing, dial in the right blend for your desired effect.

Explore enhanced modulation control with the LFO Phase L/R Offset feature. This parameter allows you to adjust the phase relationship between the left and right channels. By offsetting the LFO phase, you can achieve interesting stereo imaging effects and create a more spatially dynamic phasing experience.

LFO Shape repeat internal waveforms of the original pedals, but also include Custom Shape mode, where user can select between Sine/Triangle/Parabola waveform.

Try the SmallStorm phase shifter effect as part of your Reason Rack today.

We hope SmallStone inspires creativity and enhances your musical journey. Enjoy the rich, swirling tones that pay homage to the legendary and modified modern phaser.

USA V1 mode

1974 - 1978
Original version of the first Small Stone, based on OTAs labelled EH1048 (CA3094AE chip). Rounded sweep & classic vinyl warmth character.

USA V2 mode

Early 80s
Second version of the Small Stone, based on custom CA3094 clone (also labelled EH1048). Similar layout, slight change in component selection. Smoother edges, bright vocals.

USA V3 mode

Mid 80s
Based on dual OTA (x2 LM13600), 1x LM324N.
Clean, modernized design. Easier to build and calibrate.
Cleaner, modern feel.

USA V4 mode

Late 80s
Based on 5x OTA CA3094AE chips.
Precision-matched stages, higher consistency. Sometimes misidentified as “Sovtek” due to 5-chip layout.

USA Nano V5 mode

2000 - Now
Based on Op‑amp design: 1x TL072 or NE5532 + modern CMOS LFO
Surface-mount (SMD), very compact, triangle LFO. OTA replaced by op-amp + JFET stages.
Precise, even sweep — very mechanical
Color parameter reversed vs all other versions: Color OFF = sharper phasing.
Modern circuit, still fully wet

USSR (Sovtek™) v1

1. Based on 5x CA3094E (Russian package), Russian passive components
   Often green case. Warm and gooey. Slightly slower attack
   Highest resonance under all other versions.
   (Sovtek v1 is warmer, v3 gets sharper and fatser)

RUSSIAN (Sovtek™) v2

1993-95.
Based on 5x CA3094E (Russian package), Russian passive components
Usually black case, improved soldering.
Slightly brighter Color feedback, but near to V1.
Sweep speed isn’t symmetrical.

RUSSIAN (Sovtek™) v3

1995-2000.
Based on 5x CA3094E (Russian package), Russian passive components
Warmer and looser due to PSU + caps
Sovtek V3 gets sharper, ore intense and faster (V1 is warmer).

TURN2ON CUSTOM mode

Flexible Phaser Engine, based on the SmallStone Phaser parameters, and possibilities to make your own sound from it with free controls like Color (Feedback), Spread, Boost, LFO Shape, Filters control and other.

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Device inspired by the legendary Phase Shifter effect from ’70s.
Born in 1974, the Small Stone™ quickly became known for its lush analog sweep. 
Over time, EHX released multiple revisions—each with unique ICs (CA3094, LM13600, TL072) and sonic character. 
Meanwhile, the Sovtek-era pedals in Russia offered their own warm, gritty take.

Controls / Front Panel

PEDAL MODEL:
SmallStorm Phaser emulates all 8 hardware versions of the classic EHX Small Stone™ pedal.
Users can select any model—from USA versions V1–V4 (including the Nano V5) to the Soviet-era Sovtek V1 and Russian versions V2–V3, or switch to the Custom mode with full access to advanced parameters for deep control of the phaser engine

SYNC: Synchronize the Rate to tempo. Switch rate control between cycles per second and synced speed to tempo value (quarter-note beats)

RATE: Adjusts the speed of the phasing sweep (modulation rate)

STATUS LED: Light up at the end of every LFO modulation cycle. When the incoming signal is not active, fx processing stops and LED visualization of the LFO position is stopped.

COLOR: Adding resonant peaks between the notches (fixed in hardware modes, adjustable in Custom)

COLOR POLARITY: Switch feedback polarity (Positive/Negative). By default Polarity is Positive, only v5 Nano is Negative

COLOR CUT: Reduce phase shift processing at selected low frequencies.

DEPTH: Control the depth of the phasing effect. Higher settings produce more pronounced modulation, while lower settings yield subtler results.

SPREAD: Adjust the stereo spread to widen the phaser’s spatial presence. Offset between L/R channels

BOOST: Engage the Boost feature to add gain to the phaser effect, enhancing its presence and impact.

MIX: Mix between the Dry (incomng) and Wet (processed) signals

INPUT: Level of the dry (unprocessed) input signal before it goes to the Mix control

LP FILT: Lowpass Filter (12 db/oct): Cut High frequencies

HP FILT: Highpass Filter (12 db/oct): Cut Low frequencies

LFO PHASE L/R OFFSET: Control the LFO phase offset between the L/R channels to fine-tune the stereo phasing fx.
- STEREO IN -> STEREO OUT: 0 or 360 degrees
- MONO IN -> MONO OUT: 0 or 360 degrees
- MONO IN -> STEREO OUT: 90 or 180 degrees
Adjusting the LFO Phase L/R Offset can result in unique stereo widening effects, emphasizing the stereo field and allowing you to sculpt the phaser’s spatial characteristics to fit the demands of your mix

ENABLE: Standard switch:
BYPASS - disable effect
ON - enable effect
OFF - mute incoming signal

SOFT BYPASS: Soft Bypass with smoothed fade in/out functionality. LED light up when fx processing is disabled

Rear Panel

LFO WAVE SHAPE: Adjust the LFO from a sine to a triangle waveform. In old, classic analog phasers, it was challenging to emulate a clean sine LFO waveform (ideal for sound). Some phasers use a triangle or a tri/sine-modified waveform for the LFO

AUDIO I/O: Mono or Stereo Input / Output connections for audio signals.

CV INPUTS:: Use these CV inputs to control the main parameters by external CV source curves

SIGNAL ROUTING: Spreading fx
Control the LFO phase offset between the L/R channels modulation to fine-tune the stereo phasing fx.