Behringer BM-15M Resonance Filter

Got mine in about a week ago and ran it through extensive testing.

Build quality is so-so, slightly misaligned inputs with respect to the chassis, thin, resonant plate steel and delicate wooden sides with sharp edges that will get dented easily.

My unit doesn't have the whine the initial units seemed to be suffering from, but it does have the issue of not bypassing the sound to the right channel (only left). Also, there's no way to completely turn down the volume, as sound always keeps bleeding through, even with Output set to 0.

The filters with respect to the patterns in the editor are mixed up, with the highest filter control actually affecting the lowest band. Very confusing and this makes the patterns play unlike they're intended to sound.

Same with MIDI notes to trigger the filters: The highest C controls the lowest band. Totally illogical and unlike the real MIDI Murf.

The unit is generally very unstable as soon as you want to start using it over MIDI from a DAW. The unit froze up on multiple occasions, like it could no longer handle any further MIDI input. Total freeze until power cycle.

When it is working, it's a really cool effect so I'm a bit torn. But I will have to return this one since I don't trust the damn thing. Will try again later.

There's several things wrong with this device and they have been mentioned by other people.

With the clock too slow, you'll get rubbish results, but hit the sweet spot, at tempos to high to tap tempo, and the box jumps into life.

This is a time based effect and rate control is where you use it like a hero or zero. There is a tap tempo input but unless you can tap 16's, I wouldn't bother.

Fortunately there's a midi in for clock, but Behringer have decided not to share the midi implementation with the world.

Search for murf box pdf and life will become wonderful unless you are not using midi clock and cc commands. Without the use of clock divisions, this box might as well go in the bin.

I’d been looking at this pedal for a while, and now that I finally have it, I’m very impressed overall.

The only downside is that there’s no manual included in the box, and there isn’t one available on the Behringer website either. You have to figure things out by trial and error. That said, the controls become intuitive after a short time, and the discovery process was actually quite enjoyable.

The pedal offers 12 rhythmic patterns, giving plenty of creative options. By adjusting the frequency controls, you can get anything from auto-wah style sounds to more psychedelic filter effects. The Drive control is also a nice addition, adding a bit of grit when pushed.

Build quality feels solid, and the unit is quite large compared to standard pedals, so keep that in mind when planning your pedalboard.

For the price, this is excellent value. I honestly didn’t expect this level of performance at such a low cost.

I haven’t yet tried it with a synth or explored the external connections, but for guitar use alone, it’s already a very fun and inspiring pedal.