- Retro-Sonic has perfectly replicated one of the most sought-after vintage compressors around, the gray model Ross Compressor. While an old Ross comp in good shape is both rare and expensive, the Retro Sonic Compressor is both relatively affordable and readily available. Known for its natural sounding compression and smooth attack response, this pedal can put the finishing touches on your guitar’s tone. The Retro Sonic Compressor is updated with a few fresh features like an attack speed control. From ultra fast attack to a gradual swell, this pedal responds fantastically to any kind of picking style, making it a truly versatile effect. Chords will jump out at you, sounding tight and focused, while single notes sustain forever! This Compressor can also add a clean boost, perfect for putting your amp into overdrive. Made from the finest components, the Retro Sonic compressor offers low noise and incredible transparency. And of course, True Bypass is standard as well as a beefy met