The WarbleSwellBadPassengerFuzzPhaseEcho is a three-in-one pedal from Mattoverse Electronics that combines three of the maker's own circuits in one enclosure: the Bad Passenger Fuzz MKII, the Just A Phase phaser, and the Warble Swell Echo MKII1. Mattoverse built it around a signal path the maker describes directly: "I built this because I really dig the sound of the Bad Passenger into the Just A Phase and having the Warble Swell Echo" at the end, which the maker says takes the sound "to a peak level of PsychRock"1.
Mattoverse describes this unit as "very likely a one-off build"1. Unlike the maker's standard pedals, it is not a regular production model, and availability depends on this single unit.
Three pedals in one enclosure
The unit gathers three effects that Mattoverse also sells separately, including the Bad Passenger Fuzz MKII. The maker describes the combination as "the sound of the Bad Passenger into the Just A Phase and having the Warble Swell Echo" at the end, which it says takes things "to a peak level of PsychRock"2. In this enclosure the three effects run in that fixed order, with the fuzz first, the phaser in the middle and the echo last1.
The enclosure itself is compact, with pedalboard-friendly top-mounted jacks, which keeps the footprint small and makes cable routing on a board straightforward1.
Switching, bypass, and connections
All three pedals inside use soft-touch relay true-bypass switching, and each can be turned on independently, so the fuzz, phaser, and echo can be used alone or stacked in any combination1. The enclosure carries one mono input and one mono output, plus one DC power jack; there is no stereo path through the unit1.
Price and availability
Mattoverse lists the WarbleSwellBadPassengerFuzzPhaseEcho at $479.00 USD as of 26 October 20261. The maker ships it via USPS Priority Mail within 1 business day1.
Questions
Which pedals are inside the Mattoverse WarbleSwellBadPassengerFuzzPhaseEcho?
The enclosure holds three Mattoverse circuits: the Bad Passenger Fuzz MKII, the Just A Phase phaser, and the Warble Swell Echo MKII. Mattoverse describes the combination as the sound of the Bad Passenger into the Just A Phase, with the Warble Swell Echo at the end, taking things to what the maker calls a peak level of PsychRock.
Can each effect be switched on independently?
Yes. Mattoverse states that all three pedals in the enclosure use soft-touch relay true-bypass switching and can be turned on independently, so you can run the fuzz, phaser, and echo alone or in any combination.
Is the WarbleSwellBadPassengerFuzzPhaseEcho true bypass?
Yes. According to Mattoverse, all of the pedals in the unit use soft-touch relay true-bypass switching, and each of the three effects can be engaged or disengaged on its own.
Is it mono or stereo?
It is mono. The enclosure has one mono input and one mono output, along with a single DC power jack. There is no stereo operation.
Is this Mattoverse pedal a limited edition?
Mattoverse describes the WarbleSwellBadPassengerFuzzPhaseEcho as very likely a one-off build, so it is more limited than a typical limited edition: the maker indicates there is likely only this single unit.
Sources (2)
- Mattoverse WarbleSwellBadPassengerFuzzPhaseEcho, Mattoverse Electronics
- Mattoverse's Bad Passenger Fuzz MKII promises “bright aggressive grind to darker compressed filth” tones, guitarworld.com, 2020-12-08
