For stage, studio, or practice tool, the BP200 has just about any effect you’ll need to get the sound you want – plus a built-in drum machine for use as a practice tool. Description: 16 bass amp and stompbox models and a host of other effects (22 total) for creating your own signature sound. The built-in expression pedal can be assigned to control your choice of parameters in real time. Each effect includes up to 3 adjustable parameters giving you the flexibility to create the exact sound you are looking for. The 6 character alphanumeric display and 3-knob matrix based user interface provide simple, straight forward editing functions. The Rhythm Trainer is a great tool for polishing up your timing with your choice of different patterns, tempo, and adjustable volume level. A chromatic tuner lets you quickly check or tune your instrument to 1 of 4 different tuning references. Here’s a brief demo that runs through a few cool patches (link) and here’s a bunch of Harmony-Central reviews. Sells new for $149 but this one’s in nice shape for just $79.