Libby Unit - Dual Reverb with gNarly Overdrive

Marla Amplification – Libby Dual Reverb with gNarly Overdrive

The Libby is designed for musicians who crave expressive, spacious, and dynamic ambient effects. Built for guitarists, synth players, and studio professionals alike, Libby breaks from the sea of “same-old” reverb pedals by offering a versatile dual-tank system, a unique reverb-source selector, and a harmonically rich tube overdrive—all in a format that integrates effortlessly into any workflow.

Key Features & Functions

Dual Reverb Tanks

Libby features two independent reverb tanks, allowing you to blend Bright / Short and Dark / Long decay characteristics. Each tank has its own output, but the signals are internally mixed and can be combined using a YPP-106 style Dual Mono TS (male) to Mono TS (female) cable.

• Bright / Short Reverb
  This is the classic, familiar reverb tone for guitarists. Staying true to Marla’s customer-first design philosophy, early feedback and sneak-peek demos led to this circuit being “always on.”
  A 3-spring tank delivers a punchy splash with an immediate, slap-back character.

• Dark / Long Reverb
  A spacious, atmospheric option that reaches deeper into the midrange for a lush, immersive decay. This tank is also tied to a footswitch jack on the rear panel.
  Engaging the footswitch transforms it into a lead boost with ambient decay—a nod to the iconic Golden Cello overdrive-with-delay effect.

Want the opposite configuration—Bright with long decay and Dark with short?
Simply swap the tank outputs. Libby is designed to let you tailor the experience.

gNarly Tube Overdrive

Libby’s signal path pushes into a thick, harmonically rich overdrive. Players can roll back the gain for a smooth, buttery texture or turn it up for a fuzzy, aggressive voice with defined transient attack.
Producers will appreciate the tactile, real-time controllability of this analog overdrive, perfect for hands-on studio workflows.

A footswitch jack is included on the direct signal output, giving performers seamless control during live sets or tracking sessions.

Reverb Source Select – Four Unique Voicings

This proprietary function allows players to choose the source feeding the reverb driver, creating four distinct reverb personalities:

1. Ground
   No signal is driven to the tank—only mechanical vibration and stage resonance feed the reverb. Perfect for experimental, ambient noise textures.

2. High Pass
   Only high-frequency content from the fourth source (Overdriven Reverb) is fed into the tank, producing a shimmering, bright splash.
   While not an octave-up shimmer, it offers a similarly ethereal flavor ideal for studio layering.

3. Standard
   The most traditional reverb path, sourcing from the first gain stage and delivering the familiar, baseline tone most players expect. A great default setting.

4. OverDriven
   A truly unique mode that feeds the reverb tank after the Gain control—meaning your reverb is literally saturated with overdrive.
   Both the Gain knob and the footswitch affect this voicing, unlocking entirely new ambient textures.