The Subdecay Quasar DLX sees the return of the original's LFO waveforms, with an improved four-stage analog OTA-based phaser. The LFO speed can be controlled either by tap tempo or by holding down the tap switch to manually control and engage the Dual Action Speed Knob, for speeds ranging from a 45-second sweep up to ring modulation at nearly 300hz. The Color knob controls the phaser's intensity, and the pedal also supports the addition of an expression control for manually sweeping the phaser like a wah and/or controlling its speed.