If you’re looking for something more intricate than the Zoom B2, the ME-50B, current model from Boss, has it all and it’s laid out much more like a bunch of stomp boxes with plenty of dedicated knobs for easy editing, plus an expression pedal. If you’re like me, not a fan of LCD screens menus, and cursor buttons, with the ME-50 you just reach down and twist a knob! Effects are divided into six sections – Compressor/Limiter, Master, Filter/Tone, Drive/Synth, Delay/Modulation and Expression Pedal-giving bassists a range of unique and powerful BOSS tones. From there, ME-50B effects can be edited using 23 knobs and controlled via three built-in footswitches and an assignable expression pedal. It has some new stuff on it, like Octave-up effect plus wah, defretter, and the warmest overdrive sounds yet. You can also built loops and add kick drum patterns. For full specs, clips, etc., click here for Boss’s site and here for Harmony-Central reviews There are a number of YouTube demo’s; here’s one to start with Sells new for $299 everywhere but this one’s barely used and just $215. Includes manual and power supply.