The MXR/ Custom Audio Electronics Boost Overdrive. Designed by Bob Bradshaw and made by MXR this is a super versatile stompbox. I shouldn't have been so surprised by ow good this sounded but I was! Ton's of tones at hand and it looks great and like all the MXR stuff built like a tank. I got mine from www.soundsgreatmusic.com and so can you. Just tell em you heard it at The Tone Shack!