In addition to the classic vibe controls, the Depths features unique controls for Voice and Throb. The Voice control adjusts the midrange focus of the Depths, which is perfect for tailoring the effect to your particular instrument. Clockwise, you'll hear a fuller sound with a low-end focus. Counter-clockwise, you'll hear a thinner, spikier sound with a forward upper-midrange bite. The Throb knob adds a hefty subharmonic low-end pulse to the vibrato signal, which is especially useful on synthesizers and the bass guitar. It sounds great with a little bit of dirt on the neck pickup of a guitar, too! This works best with the Voice turned counter-clockwise for a warmer tone.