Aug 11, 2010 For owners of older Disklaviers looking for an easy way to upgrade and get the latest technology for their pianos, the wait is over. The DKC850 Disklavier Control Unit, which we reported on back in January after its unveiling during the NAMM show, is now on sale and ready to give you many of the features of the latest E3 Disklavier models. With the DKC850, owners of Disklaviers in the Mark