Per the UJam website:
Your loud-mouthed, rebellious and high energy bassist with bite! ROWDY confidently delivers picked overdriven electric bass sounds suitable for a variety of styles, ranging from powerful punk to red-hot rock and modern metal. If your bass needs to cut through heavy drums and a wall of guitars, then ROWDY is the perfect solution.
Unfortunately, you have to MIDI learn all MIDI CCs (16), (not a big deal), because you can't import or save the mapping until an update from Ujam. Cubase users can import a track from a project with VB Royal already mapped.