Anyone using or tried one? Looks quite plain to me but wondering if there is something not obvious. There is a short thread no Talkbass. https://www.talkbass.com/threads/mxr-m281-thump-bass-preamp.1443178/   MXR M281 Thump Bass Preamp The MXR Thump Bass Preamp is a tone-sweetening, signal-boosting, and altogether groove-enhancing machine. This pedal was conceived when the MXR design team and our in-house bass players discovered that the Echoplex® P