The GUP Tech RCKT Shadow Phzr Douche Edition is a dual-channel phaser pedal from the Canadian builder GUP Tech. Its headline feature is two storable Rate settings that can be switched between with the left footswitch, so a player can jump between, say, a slow sweep and a fast one mid-song without turning a knob. GUP Tech describes the circuit as "an evolution of the EHX small stone, an OTA phaser with a lot of mods," and says it is "based on the late Blackout Effectors Whetstone Phaser"1.
Circuit background
The Douche Edition sits at the end of a lineage that runs from the Electro-Harmonix Small Stone through the Blackout Effectors Whetstone. GUP Tech names the Whetstone, a discontinued builder's phaser, as the basis for the RCKT Phzr circuit1. An independent technical analysis on Guitar FX Layouts, examining the Whetstone, noted the family connection:
"The small stone uses OTAs, just as this does (it is based on the small stone)"
OTA phasers use operational transconductance amplifiers as the phase-shifting stages, which is what gives the Small Stone family its character. For more on the effect itself, see Phaser Pedals.
Two rates, footswitchable
The Douche Edition's defining control arrangement is its dual-channel design: it stores two Rate settings, and the left footswitch toggles between them1. That makes it a two-speed phaser in one enclosure, rather than a pedal with a single speed set by hand.
| Feature | What it does |
|---|---|
| Dual channels | Stores two separate Rate settings1 |
| Left footswitch | Toggles between the two stored Rate settings1 |
| Circuit | OTA phaser, an evolution of the Electro-Harmonix Small Stone with mods1 |
The Douche Edition stores two Rate settings and switches between them with the left footswitch, so a player can move between two speeds without bending down to turn a knob1. GUP Tech lists it at a sale price of £109.00 GBP1.
Power and availability
The pedal runs on 9V DC, center negative, and draws 5mA, so it fits any standard pedalboard supply with room to spare1.
The RCKT Shadow Phzr Douche Edition is listed as sold out on GUP Tech's product page as of 26 October 2026. The standard RCKT Shadow Phzr is also shown as sold out3.
- List price: £109.00 GBP, as listed by the maker1
- Build location: Saguenay, Québec, Canada, where GUP Tech builds all of its pedals1
- Power: 9V DC, center negative, 5mA1
Questions
What polarity does the GUP Tech RCKT Shadow Phzr use?
The RCKT Shadow Phzr Douche Edition runs on 9V DC with center negative polarity, the same standard as most modern pedal power supplies. Power consumption is listed at 5mA, so it draws very little current and will sit comfortably on any standard pedalboard power supply without needing its own dedicated outlet.
Where is the RCKT Shadow Phzr made?
GUP Tech builds the RCKT Shadow Phzr Douche Edition itself in Saguenay, Québec, Canada. The maker states that all of its pedals are made by the company at that location, so this is a Canadian-built pedal rather than an imported or contract-manufactured one.
What is the Douche Edition of the RCKT Shadow Phzr?
The Douche Edition is GUP Tech's version of its RCKT Phzr dual-channel phaser. Like the standard model, it is described by the maker as an evolution of the Electro-Harmonix Small Stone, an OTA phaser with a lot of mods, and it is based on the late Blackout Effectors Whetstone Phaser.
Is the GUP Tech RCKT Shadow Phzr based on the Electro-Harmonix Small Stone?
Indirectly, yes. GUP Tech describes the RCKT Phzr as an evolution of the Electro-Harmonix Small Stone, an OTA phaser with a lot of mods, and says the Douche Edition is based on the Blackout Effectors Whetstone Phaser. The Whetstone itself was described by the Guitar FX Layouts technical analysis as based on the Small Stone, which also uses OTAs.
Is the RCKT Shadow Phzr Douche Edition still available?
No. As of 26 October 2026, the RCKT Shadow Phzr Douche Edition is listed as sold out on GUP Tech's own product page. The standard RCKT Shadow Phzr is also shown as sold out, so neither version was in stock at that date.
Sources (3)
- RCKT Shadow Phzr, guptech.ca
- Guitar FX Layouts: Blackout Effectors Whetstone Phaser, Guitar FX Layouts (tagboardeffects.blogspot.com), 2018-09-25
- RCKT Shadow Phzr, guptech.ca
