Remarkable envelope controlled filter
The Electro Harmonix Micro Q-Tron gives you awesome filtering effects based on the volume of the input signal. Depending on how loud or soft the input signal (the envelope) is will control the cutoff frequency or center frequency of a swept filter. As the input volume increases of decreases, so does the pitch of the filter. You can choose what frequency range the filter will pass with the MODE knob. Emphasis in LP (Low Pass), midrange in BP (Band Pass) or highs in HP (High Pass). . All this in a compact die cast enclosure that can be powered either by a regular 9-volt battery or a standard 9-volt DC barrel type adapter. Made in the USA.
Brand new with box and instructions.