Optical compresor with 6 modes (mostly affecting attack time), and a secondary compressor built in that account for 2 of those modes, one of which is dual compression for glorious sustain without distortion. The EQ section of this pedal is widely versatile for only having 3 bands, and the Bloom function really makes this pedal stand out. You can adjust the time it takes to swell into and out of the boost, making this pedal more than just a multi-utility-effect pedal - it is a masterful tool for refining the sound of your instrument. Works best on guitar, but it should not be limited to just one instrument.