The Electro-Harmonix Q-Tron envelope filter is a funky beast of a pedal with a range of control and a plethora of dancing, bouncing sounds. Shift the filter mode between high-pass, low-pass, band-pass, or a mix of all three and then take the envelope up or down at the flip of a switch. Make the effect as subtle or dramatic as you want with the Q control, and then flip on the boost for a bump in level to push your amp or other pedals downstream. A tough-as-nails case means the Q-Tron will stand tough against the bumps and bruises of gigging and touring. Always remember -- funk not only moves...it can remove. Dig?