Thank you for viewing. The QTRON+ Auto Wah envelope filter, a masterpiece from Electro-Harmonix, allows for a wide variety of sound creation. It's great as an auto-wah for funk cutting, or as a low-pass filter, used in the style of John Mayer or Tom Misch. Compared to the Q-Tron Nano, it can be used as a booster, and the 24V power supply provides ample headroom, resulting in a significantly wider range of expression. Includes the original box, and everything in the photos. No returns. No claims, no returns, please.