Grubersaberhagen

My first post... 'cos I'm stumped! I am using a podxt live as a DI for my Variax acoustic which also has a Roland GK pickup connected to a GR55 synth. I use the S1 and S2 switches on the GK2 pickup to shunt midi programs up and down in both units live (so only use the volume pedals of each unit for sound balance which is very convenient). On some of the Line 6 patch locations, switching into and out of the patch is also toggling reverb (or whatever I have the 'Tweak' set to) between 0% and 100% which is a drag. I've assumed that this is something to do with the GR55 up to this point but the programming abilities of that in midi are vast, I've checked them all on offending patches, and I am now 100% certain that it isn't the GR55 that is the root of the problem. Is there ANY way to get the XT Live to ignore CC's for variable parameters but still accept Program change commands? Turn 'off' tweak receiving realtime data? Anybody else had this or a similar issue? Hoping you can help Ob-wan, you are my only hope :) Regards Scott