To whom it may concern -- The midi implementation chart in the X-Space pedal manual is very very incorrect. The correct midi CCs for each model actually follow this logic:
TIME = CC20
PRE-DELAY = CC21
COLOR = CC22
MOD = CC23
MIX = CC31
Other model-specific CCs are assigned sequentially starting at CC24 (each model can be slightly different). So for example, the additional parameters for Hall, Room, Chamber, Church and Plate are listed in the following order, and therefore get the following CCs:
HPF = CC24
MOD RATE = CC25
SIZE = CC26
L DECAY = CC27
M DECAY = CC28
H DECAY = CC29
Also it's helpful to be aware of this other pitfall I discovered. You can control the parameters of a patch by CC, but as soon as you grab a hold of the physical knob the patch will no longer respond to CCs for that parameter. You need to reload the patch to reenable CC control for the parameter.
OK I've done my good deed for the day...