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The B-TRON III follows the tradition of auto-wahs that marked the 1970s, when the envelope filter became an essential ingredient in funk rhythms and elastic bass lines. Here, Behringer relies on a fully analog optical approach to achieve a smooth, very "alive" response that truly follows the attack of the right hand and dynamic variations.
With its various filter modes and performance-oriented settings, it targets the "vocal" and percussive sound associated with vintage pedals, while remaining easy to integrate into a modern pedalboard.
This pedal is suitable both for musicians discovering envelope filters and for guitarists/bassists already familiar with dynamic effects. It particularly shines in funk, soul, disco, rock, and fusion, but also becomes a very inspiring tool in electro and more experimental textures when placed in front of clean sounds, compressors, or light fuzz.
In live settings, it allows riffs to stand out without increasing volume, simply by sculpting the envelope. In the studio, it proves formidable on bass and keyboards to create rhythmic movements perfectly synced with the playing, without needing to automate a filter in post-production.
The B-TRON III combines direct controls and switches designed to quickly reach the ideal "sweet spot." The Mode selector lets you choose between low-pass, band-pass, and high-pass filters to adjust the amount of retained bass, mid presence, or sweep brightness.
The Peak control affects resonance (the "bite" and "vowel" effect), while the Gain control adjusts sensitivity and level, handy for switching from single-coil guitars to active basses or keyboards. The Range (Low/High) and Drive (Up/Down) switches complete the setup: you can go from a round, fat, and "bubbling" envelope filter to a sharper, snappier effect, and choose the sweep direction to radically change the feel under your fingers.
Finally, the true bypass ensures an unaltered signal when the effect is off, ideal if you chain multiple gain pedals, a fuzz, or want to preserve the instrument's dynamics.
The B-TRON III's sonic signature is its elastic and expressive character: it transforms the attack into a filter movement, delivering a very "speaking" sound. In low-pass mode, you easily get a round and smooth groove, perfect for funk bass and chicken-scratch rhythms. In band-pass mode, the famous "quack" stands out with great projection in the mix. In high-pass mode, the effect becomes brighter and edgier, ideal for parts that need to cut through.
Envelope filters of this family are linked to many iconic sounds (vintage funk, experimental rock, modern textures), and this type of character is found in artists known for their filtered and dynamic effects. The B-TRON III allows you to approach these sensations by adjusting resonance, filter range, and sensitivity to achieve either a subtle, musical sweep or a pronounced "synth-like" effect.
