With the SFX-09 Double Back Compressor, the tone-meisters at Seymour Duncan are at it again. This compressor — like most compressors — seeks to make the louder parts quieter and the quieter parts louder, along with managing transient peaks. But the SFX-09 Double Back Compressor has a slick trick up its sleeve — it gives you the option blend back some of the uncompressed signal, restoring the dynamics and feel that many other compressors often lose. This unique approach to dynamics processing makes the SFX-09 Double Back Compressor a great addition to any rig!