Tech 21 Boost D.L.A. Version 2 Analog Delay Emulator Uniquely combines delay and clean boost, up to 9dB, in one pedal. Highly sensitive controls provide a broader range of tweakability and maximum flexibility. 100% analog Mix, Feedback, Tone and Level controls for warm, organic sounds. Up to 1000 milliseconds of continuously-variable delay time. Flutter introduces modulation which adds a slight shimmering/chorus-like effect of a vintage tape echo.