I'm afraid that we don't have any of this information yet. We should have answers to all of this once the manual is available, but for the moment we can make some guesses based on the Sherwood P-965. Outlaw has clearly made some changes to the 965 in developing the 990, but we can make some educated guesses as long as we recognize that they are just guesses. The P-965's manual suggests that the RS-232 port can be used for control, but it doesn't offer any details except to suggest that any programming be done by a professional installer. Without a signal path diagram of some sort, it's impossible to know if digital inputs will be available at stereo analog outputs (zone2 and/or record) or if analog inputs are available at digital outputs. I doubt that the zone2 volume can be tied to the zone1 control, but I could always be wrong. The balanced and unbalanced outputs are probably both available simultaneously, but I doubt that there is any way to configure them separately.