Smooth envelope filter with a funky wah-wah tone! The EHX Micro Q-Tron is a smooth envelope filter with a funky wah-wah tone. The filter is controlled by its internal envelope follower, analysing the volume of your notes and the dynamics of your playing to directly sweep the filter's centre or cutoff frequency. A stronger attack or louder note will produce a wider frequency sweep while softer playing produces more subtle effects. Use the Q control to make the effect more dramatic. Specifications Circuit: Analogue Bypass: True Bypass Audio: Mono Power Supply: 9V battery included (optional 9.6VDC-200mA power adapter not included) Dimensions (in): 4.75 x 4 x 2.25 Current Draw: 15mA Year Released: 2006