Vertex Effects Steel String Supreme SR Mini

The Vertex Effects Steel String Supreme SR Mini is a compact overdrive pedal that packs the company's Steel String Supreme SR circuit into a smaller box. It was introduced in a Sweetwater demo video in November 2022, where Vertex's Mason Marangella described it as "a bite-size version of the company's classic SSS SR"¹. Like the rest of the Steel String family, it is based on the Dumble Steel String Singer amplifier, and it carries the SRV (Slight Return Version) voicing, which Marangella noted is "a little bit different than our other steel string versions"¹.

In use it is a low to mid gain pedal rather than a distortion. Marangella was direct about its ceiling: "this isn't a super high gain overdrive even if I go to the the max gain"¹. The Steel String family is built to run from clean boost through bluesy crunch into overdrive territory, and the SR Mini follows that pattern, with what the demo described as "the tube-like warmth and dynamic feel of the original unit's overdrive tones"¹.

A low to mid gain overdrive from the Steel String Singer

The Steel String line is Vertex's take on the Dumble Steel String Singer, an amp the maker describes as "model #001 of an original run of legendary 6L6 blues machines"². Premier Guitar has billed the family's approach as a "clean drive"³, and the maker positions the Steel String circuit as usable "as a gritty clean boost or low-gain overdrive," with gain settings below 1:00 acting as a fat boost and higher settings moving into the drive characteristics of a classic D-style amplifier⁴.

The SR Mini sits in that same gain range. In the Sweetwater demo, Marangella and Dani Rabin of the band Marbin ran it through its paces, with Rabin noting that he had the previous version in his own rig¹. The demo tied the pedal's tones to the players most associated with the Steel String Singer sound, describing "overdrive tones made famous by players ranging from John Mayer to Stevie Ray Vaughan"¹.

The demo video below covers the pedal's controls, its rock, jazz, and neutral voice switching, and its low to mid gain character through a range of settings¹:

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The controls and voicing switch

The SR Mini keeps the control set simple. The demo describes it as "an incredible versatile pedal with adjustable midrange focus"¹.

The Filter control is the one worth understanding. As Marangella explained in the demo, "filter control is just an interactive mid-range control," and Rabin, who uses the previous version himself, added "I love that little knob"¹.

The three voicing positions shape the overall character:

• Rock: "a little bit Bolder of a sound," acting as a boost¹
• Jazz: "it's going to mellow out a little bit"¹
• Neutral (middle): bypasses the voicing part of the circuit⁵

The middle-position behavior comes from the Steel String family's design. On the full-size Supreme, both the Bright/Deep and Rock/Jazz toggles are three-way switches, and as Marangella explained in an earlier Sweetwater demo, "if you're in the middle position of the three-way toggle it just bypasses" those parts of the circuit⁵. On the Supreme, the Bright position works like a 2k boost adding more top end and Deep like a 250 boost adding low end punch⁵.

Versions: from the Steel String Supreme SR to the Mini

The SR Mini is the smallest member of a family that has grown steadily since the original Steel String¹.

The SRV lineage matters here. The original Slight Return Version dates to the Steel String MKI era in 2018, and those pedals "routinely fetch upwards of $400 on the used market"⁷. Vertex re-released the SRV circuit in 2021 in the Supreme format, combining, as Marangella put it, "this exact circuit" with the all-analog Supreme side⁸. The SR Mini then shrank that SRV voicing into the compact box.

The full-size Supreme carries considerably more tone shaping. It adds an independent EQ section and five extra tone-shaping controls over the more streamlined Steel String MKII⁸, including modified Bright/Deep and Jazz/Rock switches⁷. The maker says the Slight Return Edition's active EQ and switches bring "more top end 'glass' and more low-end 'snap'" than the original SSS². The Mini does without those expanded controls, keeping the Gain, Level, Filter and voicing toggle.

On price, the Mini came in at $199¹, against the full-size Supreme's $249.99 RRP at launch⁶ and a $249 listing in Guitar World's 2025 roundup, where it appeared among the site's picks of notable pedals of the 2020s⁹¹⁰.

What reviewers and players made of it

Coverage of the Steel String family has also come from players who use it. In a 2022 demo of the Steel String Supreme SR Mini, Vertex's Mason Marangella was joined by guitarist Dani Rabin, who said he has the previous version of the pedal in his own rig¹. In the same demo, Marangella showed the Rock switch position, which acts as a boost for a bolder sound¹. Gearnews covered the original Supreme launch as part of its interest in the Steel String line⁶.

The family also works beyond a traditional amp. The SRV version "can do a great job going into an IR loader or cab simulation just as well as it can go through a tube amp," according to Marangella⁸, and Gearnews noted the maker's claim that the Supreme "sounds great even direct into a cab simulator/IR loader"⁶. That makes the Mini a candidate for direct rigs as well as pedalboards feeding an amp.

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