The Behringer UB-Xa is a synthesizer module designed to be used with a Eurorack modular system. It is a powerful, multi-timbral, polyphonic synthesizer with a wide range of features and capabilities. The UB-Xa is capable of creating a variety of sounds, from classic analog tones to modern digital textures. It also features a built-in arpeggiator, sequencer, and effects, as well as a range of inputs and outputs for connecting to other devices.