RiffBeast generates notes and writes them to a MIDI clip. A slider changes how 'tame' or 'wild' the note patterns are. The scale and pitch range can also be set by the user.
When a MIDI clip is highlighted in Live's Session view, RiffBeast overwrites any existing notes when generating a new riff. This allows RiffBeast to be used 'on the fly' to create new patterns while playing live. If no clip is selected, a new 1-bar MIDI clip is created.