Digital Performer 2.6 ships with MAS 2.0. Version 1.0 of the DUY plug-ins (Max, Valve, Wide, etc.) are not compatible with DUY. Contact DUY for the 1.1 update. The demo DUY plug-ins on the DP 2.6 CD ROM are version 1.1, and are compatible with MAS 2.0.