Cornerstone GLADIO MKIII

The Long-Awaited Return of the Dual D-Style Preamp

Discontinued at the end of 2022, the original Gladio held a special place among guitarists seeking organic feel and high-end overdrive. The Cornerstone Gladio MK3 marks the return of this dual-channel format, redesigned in response to requests from users of the first version.

Its concept remains faithful to the series' DNA: reproducing the harmonic richness, smoothness and responsiveness of the legendary D-Style amplifiers. These amplifiers are associated with guitarists such as Robben Ford, whose blues, jazz-rock and fusion playing relies heavily on nuance, dynamics and the ability of an overdriven sound to remain articulate.

Rather than behaving like a conventional overdrive, the Gladio MK3 acts as a true dual preamp. It lets you shape two distinct gain levels, achieve a thickened clean tone, a singing crunch or a more pronounced overdrive, without losing the direct connection between your fingers and the amplifier.

An Expressive Pedal for Blues, Fusion and Singing Lead Tones

The Cornerstone Gladio MK3 is aimed at intermediate and experienced guitarists who want to control their overdrive through their playing. It is particularly well suited to musicians who use their guitar's volume control and variations in pick attack to move from an almost clean sound to a rich overdrive, without constantly changing their settings.

Channel 1 is ideal for blues, jazz, funk, sophisticated pop or rock rhythms where transparency is essential. Channel 2, denser in the midrange and more incisive, naturally finds its place in blues-rock solos, classic rock, fusion and lead parts requiring more sustain.

On a pedalboard, it can become the centre of your drive section: one channel for the core sound, the other for solos, or both combined to push the input of an amplifier already set to the edge of breakup. Its flexible routing is also an asset in the studio, in a stereo setup or in a system incorporating multiple amplifiers and effects loops.

Two Independent Channels and Controls Designed for Playing

Channel 1 prioritises clarity, openness and touch sensitivity. Its transparent voicing preserves the guitar's personality, whether it is fitted with single-coil or humbucking pickups. At low gain, it adds dimension and gentle musical compression ; when you attack the strings harder, it naturally develops a smooth and expressive overdrive.

Channel 2 offers a more assertive character, with more prominent mids and firmer clipping. It is designed to stand out in a mix, add density to chords and give lead notes a more singing texture. The new Ratio control blends a portion of clean signal tapped from the pedal's input in parallel with the overdriven signal. The result preserves the initial attack, note definition and playing feel, even at high gain levels.

The external bass control replaces and improves upon the internal control found on the original version. This evolution makes it quick and easy to adapt the amount of low end to your guitar, amplifier and stage volume. You can tighten the low end with a powerful humbucker, or add body to a single-coil guitar without having to open the pedal.

Each channel features a compression switch. This function lets you choose between a tighter, more even and controlled response, or a more open feel with greater breathing room and dynamics. The Gladio MK3 operates internally at 30 V thanks to a charge pump powered by a standard 9 V power supply: this voltage headroom promotes cleaner transients, greater dynamic range and a response that feels closer to an amplifier.

Thanks to its four jacks, the two channels can be used together in the same chain or as two independent pedals. A dedicated mini-jack input also lets you connect a stereo latching external footswitch to select the channels remotely—a practical solution for complex pedalboards or stage setups.

The Sound

The Gladio MK3 delivers a full, warm and detailed overdrive, with compression that does not mask the guitar's character. Channel 1 stands out for its transparent, rounded character: chords remain defined, notes retain their depth, and the transition from clean to crunch depends as much on touch as on the gain level.

Channel 2 adds more mids, sustain and bite. It delivers the smooth, vocal lead register often associated with D-Style sounds, while remaining precise enough for fast phrases and extended voicings. The Ratio control prevents the overdrive from becoming too compressed: it restores dimension to the attack and preserves the feeling of a living signal beneath your fingers.

This pedal does not aim to radically transform your guitar or amplifier. Instead, it highlights their qualities by adding nuanced, harmonically rich and exceptionally responsive overdrive. It is an excellent choice for musicians looking for a boutique overdrive capable of being soft, dynamic and velvety, then dense and singing as soon as their playing becomes more energetic.

Technical specifications

Effects	Preamp, Overdrive	Type	sector
Technology	Analog	Use	guitar, pedalboard
Format	Pedal	Color	Beige

Channel 1	transparent voicing, from enhanced clean to dynamic crunch	Polarity	center-negative
Channel 2	voicing with enhanced mids and firmer clipping	Power consumption	120 mA
Required power supply	9 V DC