Electro-Harmonix Q-Tron XO Envelope Follower Pedal<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Selectable low pass， band pass and high pass filters </span></li><li><span class="a-list-item"> Resonant peak control to adjust the filter's Q from subtle to dramatic </span></li><li><span class="a-list-item"> Hi and lo frequency response modes </span></li><li><span class="a-list-item"> True bypass </span></li><li><span class="a-list-item"> 24DC-100 power supply included </span></li><li><span class="a-list-item"> True bypass Selectable low pass， band pass and high pass filters. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51YrDSHz3dL.jpg" noproxy>