The Roland V-Bass System contains the breakthrough COSM technology that takes the bass into bold new sonic dimensions. It models classic basses, lets you create your own, and includes all the popular solid state and tube amps, cabs, and original models. Unsurpassed effects include modeled wah, modeled overdrive/distortion, compression, delay, chorus, reverb, incredible synth bass sounds, polyphonic effects, and wild stuff you've never heard before. It's a snap to use with an intuitive interface and helpful graphic icons. 100 presets and 100 user patches. The V-Bass System has a built-in expression pedal for realtime control. A 1/4" jack accesses amp modeling and non-polyphonic effects. User-installable.