Is the Beat Designer and Step Designer developer still lives or alive? Its almost 10 years now, the thing never got any update. That thing needs an overhaul update and well integration with the browser or media bay so it can work independently away from Groove Agent. Combine Step designer and Beat Designer to make a better Drum Sequencer. Leave GA alone, the thing should work independently like sampler track
If I remember correctly, it was done by a 3rd party from Sweden who (later?) became involved with the development of Reason.