The True Spring’s reverb effects are based on a mechanical design created by the Hammond Organ Company™ in the late 1930s. This straightforward design uses a pair of input and output transducers to feed an instrument's dry signal into an actual set of spring coils and capture the highly distinctive reverberations created as the sound bounces through the springs. Naturally, Leo Fender adopted this design in the 1960s for some of his "blackface" amplifiers, sparking a revolution.

Short Spring Reverb: Inspired by the unmistakable twang of 1960s "blackface" amplifiers. Extensive research revealed a huge variety of spring reverb sounds across different amps; some offered a tighter, less animated tone, while others sounded "drippier," with longer sustain and livelier reverb trails. The SHORT Spring engine delivers a tight sound with a quick decay and smooth trails.

Long Spring Reverb: Produces long, deep reverb decays with noticeable "drip" and highly animated trails. The LONG Spring engine isn't quite as dramatic as the TANK Reverb engine, but it offers an incredibly authentic representation of some of the liveliest reverb tanks found in vintage combo amps.

Tank Spring Reverb (Outboard Spring): Captures the signature sound of 1960s tube-driven outboard spring tanks. Reverb tanks like the classic Fender 6G15™ are characterized by their "drippy" attack and animated trails. This original two-spring design produces a bouncy, delay-like sound that is inseparable from the early days of surf rock and spaghetti western soundtracks. THE TREMOLOS

The True Spring Reverb also allows you to combine any of its iconic spring reverb sounds with one of the pedal's three tremolo effects. The True Spring’s tremolos are the same organic effects originally featured in our Vertigo Tremolo—winner of *Guitar Player*’s "Hall of Fame 2015" and *Premier Guitar*’s "Premier Gear Award."

Opto Tremolo: Optical tremolo (aka "Photocell Tremolo") is the effect found in many combo amps from the 1960s. This version of tremolo relies on a neon bulb and a light-dependent resistor known as an "optocoupler." The asymmetrical nature of the light and optocoupler gives the tremolo a distinct, choppy character.

Harmonic Tremolo: This unique effect first appeared in Fender™ "brownface" amps made between 1959 and 1963; these amps alternately modulated the low and high-frequency levels of the audio signal. The result is a highly pleasing, complex tremolo with characteristics reminiscent of a phaser.

Bias Tremolo: This approach to tremolo uses an LFO to modulate the bias voltage of an amplifier's tubes. This essentially pushes the tubes in and out of saturation. The result is smooth amplitude modulation accompanied by a touch of overdrive created by tube saturation.

FEATURES

Three distinct spring reverb and tremolo effects.

Two operating modes: Use the pedal in Standard mode for a classic stompbox experience (no presets), or activate Preset mode to save a user preset (including reverb/tremolo effects and knob positions) to each of the three toggle switch positions. Flexible stereo routing – The True Spring is equally at home in mono or stereo rigs. The pedal's stereo inputs and outputs offer a variety of routing options, such as stereo-to-stereo, mono-to-mono, mono-to-stereo, stereo-sum-to-mono, and external loop mode.

Universal bypass — Select Active Analog (buffered) or True Bypass.

Secondary tremolo controls – Press and hold the CONTROL INPUT button to access the True Spring's tremolo effects (the DWELL knob controls tremolo DEPTH, the TONE knob controls tremolo RATE, and the toggle switch selects the tremolo type).

Expression control – Compatible with Source Audio expression pedals and the Hot Hand 3 universal wireless effects controller. Assign up to three simultaneous parameters with adjustable depth and direction.

External Tap Tempo – Use the Source Audio Tap Switch to tap in the tremolo rate, with a choice of four different time divisions (quarter, eighth, triplet, and sixteenth notes).

External tremolo engage/bypass – Use the Source Audio Tap Switch to toggle tremolo effects on or off while the spring reverb is active.