Boss RT-20 Rotary Ensemble Sound Processor<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Authentic rotary speaker sounds via COSM technology </span></li><li><span class="a-list-item"> Slow/Fast transition time is adjustable from gradual to rapid change; optional Expression pedal can </span></li><li><span class="a-list-item"> Onboard Overdrive effects </span></li><li><span class="a-list-item"> Adjustable mix balance between Treble Rotor and Bass Rotor </span></li><li><span class="a-list-item"> 4 types of sounds， from standard rotary speaker effects to rock-oriented tones， UNI-V， and more </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51UWQyBXdYL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41sR1XewrqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41XEf4nGXyL.jpg" noproxy>