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A new chapter in analog reverb sound

The LIGHT Pedal combines all the best features of a classic spring reverb with an innovative infrared optical sensor system and a unique effects section, enabling you to create countless new types of reverb textures that have never been possible before now.

Available directly from GCA, Worldwide Express Shipping

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The LIGHT Pedal is based on a mechanical spring reverb tank.

The incoming audio signal is converted into mechanical vibrations by an input transducer (a spring exciter), and a similar transducer is used at the output stage to convert the spring's vibrations back into audio signal.

Due to the springs' elasticity, even a short impulse can cause extended vibrations – this is how the traditional reverb effect is achieved. Plate reverbs use the same principle to excite large, resonant sheets of metal.

However, due to energy dissipation, by the time vibrations travel along the length of the springs and reach the output transducer, most of the harmonic content of the input signal is lost, and the output is mostly composed of the spring’s own resonant frequencies. This is why all spring reverbs have a particular sound.

The LIGHT Pedal explores a new way of picking up the spring's vibrations - using multiple sets of infrared optical sensors (acting as photoelectric pickups) placed carefully at different positions along the length of the springs.

This method allows to capture the spring tank's full range of movement and pick up a much wider range of frequencies, harmonics, overtones and textures that are otherwise lost in the mechanical reverberation process.


Digital algorithms provide amazing flexibility and limitless sound-shaping capabilities, but they haven’t been able to recreate the warmth and organic quality of analog reverb systems. The LIGHT Pedal's optical sensor technology was developed to extract a wide range of new reverb textures out of a fully analog system. The result is an extensive palette of analog reverb sounds that simply cannot be compared to or emulated by digital algorithms.


The LIGHT Pedal offers six types of unique reverb effects, which are achieved by modulating the optical sensor system and exciting the spring-tank. Each effect type can be adjusted with the CTRL knob.

The GATE knob controls a built-in dynamic envelope that lets you achieve gated or ducking reverb effects.


The LIGHT Pedal is a true analog mono reverb system. It features an assignable expression pedal input (normally assigned to the FX control knob), as well as an innovative shock sensor designed to eliminate unwanted spring-noise caused by mechanical impacts, stomping, and stage-rattle.



The LIGHT Pedal has three separate volume controls that provide detailed control over the pedal’s output signal.

These set individual levels for both the traditional spring tank output and the optical reverb system. The DRY knob cuts or boosts the instrument’s DRY signal (ranging from zero to roughly a 2x volume boost).

The TONE knob controls a powerful tilt EQ section ​that is applied to the WET signal only. The TONE knob can be used to produce a massive low-frequency boost or to accentuate only the higher reverb frequencies instead.


The drive knob determines the amount of WET signal sent into the spring tank. When set to zero, the springs will not be excited by the transducer, thus producing no WET signal at all. Gradually turning up the DRIVE knob will transmit more power to the springs, increasing their movement amplitude. This will result in longer reverb decays, an overall change in reverb texture, as well as a higher sensitivity and output volume of the spring-tank.


The LIGHT Pedal features six unique on-board FX modes that harvest the natural sound properties of the spring-tank and optical sensor system.

The FX are grouped into two main categories: Optical FX and Mechanical FX.


optics: infra-red sensor calibration mode. The CTRL knob scrolls between different combinations of optical sensor pairs. When used together with the TONE and drive knobs, the optics mode lets you extract dozens of unique analog reverb textures out of the spring tank.

sweep: creates rich modulated reverb sounds by sweeping between optical sensor pairs. CTRL knob adjusts the modulation speed, which affects the expression of the optical spring reverb system. The analog modulated reverb is constantly evolving and interacting with the input signal.

trem: a pulsating effect achieved by switching the optical sensors on and off. A tremolo effect can also be applied to the spring output. The CTRL knob adjusts the modulation speed.


reflect: a lo-fi delay algorithm that sends multiple repeats of the instrument’s signal back into the spring tank. The CTRL knob adjusts the delay time parameter. Holding the footswitch and using CTRL adjusts the optical sensor.

feedback: a special circuit that causes the spring tank to self-oscillate. The CTRL knob adjusts the central pitch of the feedback loop.

harmonic: a shimmer-style reverb effect achieved by exciting specific harmonics of the spring tank. The CTRL knob adjusts the target frequency of the effect.

These effects can be used to create soundscapes, drones and ambient layers, and they are particularly effective when used with the footswitch in momentary mode.


In sweep mode, holding the footswitch and turning the CTRL knob lets you select between various sweep curve types. In all other FX modes,  FSW+CTRL adjusts the optical sensor pairs.

FX modes can be combined by holding the footswitch and turning the FX selector knob – for example, you can combine sweep mode with reflect mode and perform individual parameter tweaks.  

fsw + gate knob makes the CTRL parameter responsive to input signal levels, thus producing dynamic variations in all FX modes.


The gate knob offers a dual-function dynamic envelope control. When positioned at 12 o’clock, no gating occurs. When turned counterclockwise, all reverb sounds are gated – the decay length is dependent on the input signal volume. When turned clockwise, the reverb effect is ducking – all incoming dry signal decreases the pedal’s wet output volume.


The tails switch determines whether the reverb output is immediately bypassed as soon as the pedal is turned off with the footswitch. 

The latch switch controls the behavior of the pedal’s on/off footswitch. In latching mode, the footswitch acts as a normal on/off switch. When LATCH is turned off, the footswitch will engage the reverb effect only momentarily – this allows you to add reverb layers on top of particular notes or chords during a performance.


The EXP input allows you to control various knob parameters of the LIGHT Pedal with any standard expression pedal. 

By default, the EXP input is linked to the FX section’s CTRL parameter, but you can assign it to any knob on the front panel (except tone).



  • United States: No Sales Tax for US Orders
  • European Union: VAT will be added to orders without an EU-VAT number
  • All other countries may face customs duties
  • Lifetime Warranty
  • 30 Day Money Back Guarantee
  • The LIGHT Pedal doesn’t come with a free power supply.  Gamechanger Audio LIGHT Pedal requires a standard pedal power supply – Barrel plug – 2.1 x 5.5 mm with a center-negative polarity with 9V DC and at least 500 mA.

    You may cancel your order any time by emailing us at [email protected]


Input TypeTip-sleeve 1/4” jack
Input impedance1MΩ
Maximum input level+ 6.8 dBu
Output typeTip-sleeve 1/4” jack
Output impedance100 Ω
Maximum output level+6.8 dBu
Peak Power Consumption4 W
Mean Power Consumption0.9 W
Power Requirements500 mA min 9V DC center negative 2.1 x 5.5 mm plug
Spring Tank3 springs type, 100 mm
Product DimensionsWLH 105 x 190 x 40 mm )4.1 x 7.5 x 1.6 in)
Product Weight1060 g (2.3 lbs)
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Meet Teodors Kerimovs - musician, engineer, inventor of the optical reverb system and head development engineer of the LIGHT Pedal.

This mini-documentary shines a light on how this beautiful audio tool became a reality: