You would think there would be a simple way to do this... How do I use the HD500 as a controller for the DT25 controls (class, topology, mode, A/B) without specifying a specific amp model? Or is there a "DT25" amp model available that can be downloaded? Related to this, is there a way to change the amp settings using the effects buttons? One would think that all this would be possible through the HD Link connection.