GFI System Rossie Multi-Filter Pedal

Name: GFI System Rossie Multi-Filter Pedal
Brand: GFI System
SKU: GF-ROSS
Availability: InStock

£219.00

Also available on — Andertons, Gear4music, Reverb, Amazon, eBay

Fresh on the menu for 2026 are the GFI System Guitar Pedals, freshly added and carefully selected. These New units are available to order online with fast, secure delivery from trusted UK retailers. Read on for full details, specifications, demos, videos, reviews, and the best places to buy the GFI System Guitar Pedals today.

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Description
Additional information

Description

The celebrated filter algorithms from GFI System's flagship Synesthesia pedal have been brought to life as an expanded, standalone stompbox! Encompassing 3 essential tone-enriching filter effects, the Rossie is remarkably dynamic and easily spices up your guitar or synth tones with some intriguing, spellbinding sounds.

With a compact enclosure, a tactile set of controls, a bright LCD screen and dual footswitches — the GFI System Rossie offers plenty of control but won't overwhelm you either. It's the perfect pedal for musicians looking to step out of their comfort zone and expand their sonic horizons!

3 Filter Effects

Envelope Filter — A colourful, resonant filter that follows and responds to your picking dynamics.
Step Filter — A groovy, arpeggiated filter with fully adjustable steps.
Manual Filter — Great for static tone shaping or sweep-able, wah-like effects using an expression pedal.

Each of these modes offers 4 filter types: low-pass, band-pass, high-pass and peaking. Sweep range and resonance width are also adjustable, and on top of all of these, a dedicated mix knob allows blending of the wet and dry signals. This gives you total control of how much filtering effect is imparted on your guitar, bass or synth signal. Smart!

Key Features

2 presets, accessible via right-hand footswitch.
3 selected filter algorithms from GFI System's Synesthesia pedal.
Mono input and output for simple routing.
Expression pedal and tap-tempo input for increased effect control.
Momentary action supported.

Specifications

Input Impedance: 1 MOhm
Output Impedance: 1K Ohm
DAC / ADC Resolution: 24 bits
Current Consumption: ~110 mA
Weight: 0.6 kg (1.6 lbs)
Dimensions: 12 (L) x 7.2 (W) x 5.5 (H) cm
Power Source: 9VDC (Centre Negative)

Additional information

Weight	0.5 kg

Brand

GFI System

GFI System is a boutique pedal company based in Jakarta, Indonesia, recognized for its high-quality guitar effects pedals and advanced signal processing units. Founded by Henry Widjaja, GFI System has gained acclaim for its commitment to innovation, craftsmanship, and sonic excellence.

The company offers a diverse range of effects pedals, including modulation, delay, reverb, and overdrive pedals, each designed with meticulous attention to detail and utilizing cutting-edge technology. GFI System pedals are celebrated for their versatility, pristine sound quality, and intuitive user interface, making them a favorite among discerning musicians and recording engineers worldwide.

One of GFI System’s standout products is the Specular Tempus, a stereo delay and reverb pedal renowned for its studio-quality sound and extensive feature set. The Specular Tempus offers a wide range of delay and reverb algorithms, customizable parameters, and MIDI functionality, making it a powerful tool for ambient musicians, sound designers, and performing guitarists alike.

In addition to effects pedals, GFI System also produces advanced signal processing units, such as the Clockwork Delay and the Cabzeus Mono, which offer studio-grade effects and amp simulation in a compact and portable format.

With its dedication to innovation, quality, and sonic excellence, GFI System continues to be a respected name in the guitar effects industry, inspiring musicians to explore new sonic territories and push the boundaries of their creativity.

Tags

envelope filter

An envelope filter reacts to your playing dynamics, opening and closing its sweep based on how hard you pick. Dig in and it quacks, ease off and it softens — delivering that unmistakable funk snap, auto-wah bounce, and touch-sensitive groove that feels alive under your fingers. It’s expressive, rhythmic, and full of character.

Use it to bring movement to clean riffs, add vocal-like sweeps to bass lines, or inject serious funk into your rhythm playing. From subtle shimmer to full-on 70s squelch, an envelope filter turns your picking hand into the control knob.

Expression

Expression pedals allow real-time control over specific parameters on compatible guitar pedals, such as volume, delay time, modulation depth, or filter sweep. Used with an expression input, they let players shape effects dynamically with their foot, adding movement and performance control that cannot be achieved with fixed knob settings.

Filter

A filter pedal shapes your tone by emphasising or cutting specific frequencies, letting you sculpt everything from subtle tonal shifts to bold, sweeping textures. Unlike traditional wah or envelope effects, filters can be static or controlled in different ways, giving you focused control over how bright, dark, sharp, or resonant your sound becomes.

Use a filter to tighten the low end, tame harsh highs, or create synth-like sweeps and rhythmic movement. Whether you’re refining your core tone or pushing into experimental territory, a filter pedal gives you precise control over the flavour of your sound.

New

This is brand new, fresh in, and a UK warranty is included. New Gear always comes from trusted UK music retailers.

Synth

A synth pedal transforms your guitar signal into rich, layered tones that mimic the sounds of a synthesiser. Using pitch tracking and waveform generation, it can produce everything from deep bass lines to shimmering pads and futuristic leads. Synth pedals open up a wide creative range, blending the expressiveness of guitar playing with electronic textures, making them ideal for experimental sounds, ambient music, or adding a modern edge to classic riffs.

Wah

Wah refers to an expressive filter effect that sweeps through a range of frequencies, creating a vocal-like “wah” sound. Controlled in real time with a foot-operated treadle, it allows players to emphasise different parts of the frequency spectrum as they play. Wah pedals are commonly used for lead guitar, funk rhythm work, and expressive solos, responding closely to picking dynamics and foot movement.

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