PastFx Deluxe Elastic Mattress

The PastFx Deluxe Elastic Mattress is an analog flanger pedal from PastFX, built as the maker's take on the classic 1970s and "green" 1980s 18-volt Electro-Harmonix Deluxe Electric Mistress¹. Where the earlier PastFX Elastic Mattress recreated the mid-to-late-1970s "V2" Electric Mistress, the Deluxe version moves up to the Deluxe circuit, with the Filter Matrix mode that pedal was known for, and packs it into a compact 1590B enclosure¹²³.

At its heart is a Matsushita / Panasonic MN3007 bucket brigade device (BBD), the analog delay chip the vintage EHX flangers were built around; PastFX fits new old stock (NOS) examples of a chip no longer in production¹⁴. The result, in Guitar Pedal X reviewer Stefan Karlsson's words, is a flanger with "a slightly richer and denser texture than the original Mistress mattress"².

A Deluxe Electric Mistress circuit in a 1590B

PastFX describes the Deluxe Elastic Mattress as "our original spin on the Deluxe Electric Mistress pedal made by Electro-Harmonix in the late 1970s & 1980's"¹. The original Deluxe Electric Mistress descends from the 1976 Electric Mistress, a unit MusicRadar notes was "widely used in studios around the world"⁶. Electro-Harmonix's own current Deluxe Electric Mistress lists true bypass and ships with a power adapter⁷.

The Deluxe Elastic Mattress is the fourth major iteration of PastFX's Electric Mistress circuit. Guitar Pedal X's Stefan Karlsson, who owns the V2 and V3 Elastic Mattresses, counts the Deluxe as the fourth and says it "completes that trifecta for me," while noting the V3 and Deluxe "are considered different circuits" since one follows the standard Mistress and the other the Deluxe²⁴. The pedal brings the Deluxe circuit's key features into a 1590B compact unit, which Karlsson describes as "bringing all those key mods together in the one sleek 1590B compact unit"²⁶.

One thing the Deluxe omits compared with its immediate predecessor: Guitar Pedal X reports it "makes do without the 2n Stereo Output Port of its predecessor"⁴.

The controls

The control set follows the Deluxe Electric Mistress layout and adds PastFX's own options¹⁴.

The voicing switch is worth a closer look for anyone comparing vintage units. PastFX explains that "this button changes between the two different audio filtering designs used in the circuit, the early darker circuit and the lighter filtering of the classic 'green' deluxe mistress"¹. So one pedal covers both eras of the original.

Two LEDs show the pedal's state: a blue LED on the right toggle for Filter Matrix mode and a green LED on the left toggle for Normal mode¹.

The Filter Matrix mode is one of the Deluxe Elastic Mattress's features: its Filter Matrix switch is described as a static LFO bypass, and the mode is indicated by a blue LED on the right toggle⁴¹.

Power: 18V DC, 160 mA

The 18V requirement is faithful to the original: the vintage Electric Mistress circuits the Elastic Mattress line is based on were themselves 18-volt designs³. The earlier Elastic Mattress was listed at 18V DC center negative with a 25 mA draw³, so the Deluxe's 160 mA figure is a step up in current demand.

Versions: the fourth Elastic Mattress

The Elastic Mattress line has evolved through several versions³⁴⁸:

• Original Elastic Mattress: based on the mid-to-late-1970s "V2" EHX Electric Mistress, with external Rate, Range and Color knobs³⁸.
• V2 (2022): added Stereo Output and a new external mini Level knob⁸.
• V3: a further version with a new internal bass cut control and an external brightness control, plus stereo outputs over previous versions³.
• Deluxe Elastic Mattress (2025): the fourth major iteration, based on the Deluxe Electric Mistress circuit, adding the negative feedback and voicing pushbuttons⁴¹.

The Deluxe Elastic Mattress is the fourth major iteration of the PastFX circuit, following the V2 and V3 Elastic Mattresses; one reviewer who owned both earlier versions described the Deluxe as completing the trifecta⁴². PastFX positions it as an original take on the classic 1970s and green 1980s 18-volt EHX Deluxe Electric Mistress flanger¹. The listed price is $207⁵.

What reviewers said

Guitar Pedal X's Stefan Karlsson reviewed the Deluxe Elastic Mattress in October 2025 and found it needed no internal tweaking²:

He favors the Positive Feedback and the 80's Lighter settings overall². In the 2025 year-end roundup of new modulation pedals, Guitar Pedal X gave the Deluxe Elastic Mattress a Silver award⁵.

Looking back at the earlier Elastic Mattress versions, Karlsson wrote in November 2024 that "Both of mine sound exceptional," adding that the second iteration "really allows you to get the most out of this typically quite bright and sparkly flanger sound"⁹. When the V2 launched in 2022, he judged it "possibly the most special one in the Trifecta" of PastFX flangers, calling it "the ultimate of this genre with no direct equivalent"⁸.

Delicious Audio, profiling the Elastic Mattress line in 2022, highlighted the added Blend knob "that allows to reintroduce the clean signal under the effected one" and a Bright switch, both expanding on the original Mistress control set¹⁰.

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