Mooer Bass Sweeper

A modern envelope filter in the lineage of funk and fusion sounds

An envelope filter (often compared to an auto wah) has marked the history of funk sounds by its ability to "speak" by following the musician's dynamics. The Mooer Sweeper captures this spirit: a filter that triggers at the slightest ghost note, closes at the end of the note, and transforms a bass line into a living pattern. Its particularity is to add a Fuzz mode that pushes the effect into more muscular territories, perfect for fusion aesthetics, edgy rock, and certain electro/experimental approaches.

Within the Mooer range, the Sweeper is clearly aimed at those who want a signature effect in a small format: a compact pedal, easy to adjust, but capable of moving from funky "quack" to much more extreme saturated sweeps.

For whom, for which styles, and in what contexts?

The Sweeper primarily targets bassists looking for an envelope filter for slap, syncopated grooves, palm-muted riffs, or pick playing with a very articulated side. In Clean mode, it excels in funk, soul, disco, pop registers and anything that requires automatic filter movement without having to manage an expression pedal.

The Fuzz mode is ideal if you play fusion, modern rock, or want to make a bass line stand out in a dense mix with more harmonics. On guitar, the Sweeper becomes a formidable tool for funky chicken picking, "speaking" leads, and textures bordering on phaser/auto-wah, with real right-hand / guitar volume interaction.

Live or in the studio, it fits very well before modulation/delays to maintain rhythmic impact, or before a light overdrive to thicken the sweep. On a minimalist pedalboard, it is also an excellent "highlight pedal" for a verse that instantly switches to an explosive chorus.

Controls, modes, and handling

The Mooer Sweeper goes straight to the point with three controls and a mode selector, which facilitates quick adjustments on stage. The Intensity knob adjusts the sensitivity: the higher you set it, the easier the filter opens (useful with light playing, passive pickups, or soft fingerstyle). The Reso knob controls the resonance: low, the effect remains round and subtle; high, the peak becomes more pronounced, more "vocal," with a very funky and percussive character.

The Range knob determines the frequency range swept by the effect. On bass, a lower range emphasizes a thick and mellow groove; on guitar, a higher range delivers a brighter and more incisive "wah." Finally, the 2-position switch lets you choose between Clean (dynamic filter) and Fuzz (filter + saturation for more radical textures).

Like all Mooer pedals advertised as True Bypass, the Sweeper is designed to preserve your tone when the effect is off and to pass the signal even when the pedal is not powered.

The sound

The Sweeper is characterized by a very responsive sweep that highlights attacks and playing nuances: in slap, each pull/pop triggers a clear filter movement; in fingerstyle, the effect can become more "liquid" and singing, especially with higher resonance. In Clean mode, you easily get funky, vocal tones, with that famous "quack" typical of envelope filters.

The Fuzz mode brings another personality: more harmonics, a rougher texture, and a sweep that stands out strongly in a mix. This opens up more aggressive sounds, very effective for fusion parts, pick riffs, or transforming a simple line into a true rhythmic texture. Overall, the pedal is rather coloring (which is expected from a filter), but remains controllable enough to go from a subtle effect to a fully assumed sound.

Technical specifications

Effects	Distortion / Overdrive / Fuzz, Envelope / Auto-wah	Use	electric bass
Format	Pedal	Color	White
Type	sector

Intensity	filter sensitivity adjustment	Power input	DC IN
Reso	resonance intensity adjustment	Dimensions	93.5 mm (L) x 42 mm (W) x 52 mm (H)
Range	frequency range adjustment	Weight	160 g
2-position switch	Clean / Fuzz	Power supply	not included
Input	6.35mm Jack unbalanced (impedance: 220 k ohms)	Required power	9 V DC (center negative)
Output	6.35mm Jack unbalanced (impedance: 1.4 k ohms)	Consumption	7 mA