Behringer BM-11M

The Behringer BM-11M is a vintage-style analog low-pass filter pedal. A low-pass filter lets the frequencies below a chosen cutoff point through and rolls off the ones above it, which is what gives filtered guitar and bass parts their dark, vocal, synth-like character. Behringer describes the pedal as delivering "warm, resonant filtering to your pedalboard or studio rig with an unmistakable analog character"¹.

At the heart of the pedal is an envelope follower, a circuit that tracks the level of your input signal and moves the filter cutoff in response to how hard you play. Behringer says it "reacts to your playing dynamics and input signal in real time"¹. The pedal is not limited to guitar: Behringer says it works with "a guitar, bass, synth or a drum machine"¹.

Controls and how it shapes the sound

The front panel gives you five controls, each handling one part of the filtered sound¹:

The Envelope Amount control is the one that makes the pedal feel alive under your fingers: turn it up and the cutoff sweeps with every note you dig into, turn it down and the filter sits where you set it with Cutoff. The Mix control lets you keep some clean signal in the blend, which is useful for bass players who want the filter effect without losing their low end¹.

The filter itself is selectable between 2-pole and 4-pole operation, with a resonance control². A 2-pole filter rolls highs off gently, keeping more of the source tone above the cutoff; a 4-pole filter rolls off twice as steeply for a darker, more dramatic filtered sound. Being able to switch between the two on one pedal covers both the subtle and the extreme ends of filter playing.

Behringer says the internal circuitry offers "studio-grade headroom and thick harmonic response"¹.

Connectivity: MIDI, USB-C and expression

The BM-11M goes beyond the usual pedalboard connections. RockBoard's listing specifies both USB-C and MIDI control for integration with other gear², and Behringer's own product page lists the pedal with USB/MIDI control¹. That puts it in reach of players running MIDI pedals or computer-controlled rigs, where the filter can be automated or synced rather than only moved by hand or by envelope.

There are also expression pedal inputs for real-time control over parameters². Behringer frames the expression inputs as making the pedal "ready for pedalboards and modular rigs"¹, so a player with an expression pedal on their board can sweep the cutoff by foot the way a wah player works their pedal.

Build and power

The pedal sits in a rugged metal chassis with vintage-inspired wood panels, a look RockBoard describes as providing "a classic look and durability"².

Where it sits in Behringer's filter line

The BM-11M sits in Behringer's filter pedal line as a low pass filter aimed at players who want more than a stompbox. It works with guitar, bass, synth or a drum machine¹, and its expression pedal inputs make it ready for pedalboards and modular rigs alike¹². Behringer describes the internal circuitry as offering studio-grade headroom and thick harmonic response¹. At a list price of $95.00 USD³, it carries the same price point as the Meatball, another filter pedal in the range, while its drive control for input gain² and real-time expression control over various parameters² give it a more integration-oriented feature set.

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