The Okko FX Rectoplexxx is a high-gain overdrive and distortion pedal from the maker Okko FX. RockBoard's PedalPedia describes it as a pedal that blends the crunchy "Plexi" grind with saturated "Recto" style distortion, giving players a versatile range from tight British-style crunch to thick modern amp-like distortion1. In other words, it aims to cover two gain flavors players usually reach for two different pedals to get: the cranked-amp bite of a classic British head and the thicker saturation associated with modern high-gain amps.
What it does to your sound
Okko FX positions the Rectoplexxx as a two-voiced gain pedal. At one end of its range you get the crunchy grind of a "Plexi", the shorthand players use for a certain era of British non-master-volume heads; at the other, the saturated, thicker distortion associated with "Recto" style modern high-gain amps. RockBoard's PedalPedia describes the result as a versatile range from tight British-style crunch to thick modern amp-like distortion1.
It sits in the distortion family, alongside related gain stages like overdrive and fuzz, but it is built specifically for players who want high gain with a voicing they can shape1.
The controls: Drive, Level, Treble and Shape
The Rectoplexxx keeps its panel to four controls, each with a clear job1:
| Control | What it does |
|---|---|
| Drive | Sets the amount of drive, the core of the pedal's gain1 |
| Level | Sets the output level1 |
| Treble | Tames or sharpens the high end, helping dial in anything from classic rock crunch to full-on metal distortion1 |
| Shape | Switches between a mid-scooped metal voicing and pronounced upper mids that cut through a mix1 |
The Shape control is the pedal's voicing switch and the key to its two characters. In the mid-scooped position it leans toward the scooped low-mid look of modern metal tones; in the other position it brings up pronounced upper mids so the pedal cuts through a band mix1. Combined with the Treble control, that gives the player a wide sweep of gain voicings from one pedal.
Power: 9V in, 24V inside
The Rectoplexxx runs from a standard 9V DC, center-negative supply and draws 45mA1. Inside, the pedal uses a charge pump, a small circuit that raises a supply voltage, to lift its working voltage to 24V, which RockBoard's PedalPedia says gives the circuit extra headroom and dynamic range1.
The Rectoplexxx draws 45mA at 9V DC, center negative1. A supply or daisy chain output rated below that current is not a good match; give the pedal its own output with enough current on hand.
Questions
Is the Okko FX Rectoplexxx analog or digital?
The Rectoplexxx is an analog pedal. Its circuit runs on 9V DC from a center-negative supply, and an internal charge pump raises the working voltage to 24V, which the maker says gives the circuit extra headroom and dynamic range. It is a dedicated distortion unit with no digital processing or presets.
What power supply does the Okko Rectoplexxx need?
The Rectoplexxx runs on a 9V DC, center-negative power supply and draws 45mA. Because of that current draw, a standard low-output daisy-chain supply may not be the best match; a supply with enough current on tap is the safer choice. The pedal uses an internal charge pump to raise its working voltage to 24V internally.
What does the Shape switch do on the Rectoplexxx?
The Shape control switches between two voicings: a mid-scooped metal voicing with the mids cut, and a setting with pronounced upper mids that cut through a mix. Together with the Treble control, it lets the pedal move from classic rock crunch to full-on metal distortion.
Does the Rectoplexxx work for both classic rock and metal?
Yes, that flexibility is the point of the design. The maker describes the pedal as blending crunchy Plexi-style grind with saturated Recto-style distortion, and the Drive, Treble and Shape controls let players dial in anything from tight British-style crunch to thick, modern, amp-like distortion.
Sources (1)
- Rectoplexxx by Okko FX, RockBoard PedalPedia, 2026
