I have TTS-1, SI-Electric piano and Rapture all responding in unison to one of my keyboards. I use the knobs to adjust parameters of the synths, particularly the TTS-1. The problem is I DON'T want Rapture to respond to these changes.
 
The knobs are sending Cutoff, Attack, Release etc.
 
Is there a way to tell Rapture NOT to respond to these MIDI messages?
 
John 

Deselect the input device in the Rapture MIDI track input field.

I want Rapture to play, I just don't want it to respond when I adjust, say, ATTACK for the TTS-1. When I try to adjust the TTS-1 ATTACK time with the Oxy49 knobs, for instance, it also adjusts Rapture, which I don't want. 

So are you saying you want all three synths to receive everything except specific controler knob date, both TTS1 and S1 Electric Piano to receive controller data from the keyboard knobs but Rapture not to receive the knob data? In other word filter the controller knob data out of the keyboard output stream only for Rapture? And of course you want to do that in real time for all three synths at once.
 
If your keyboard can  assign the knob output to just specific MIDI midi channels, that would be the obvious answer. If not, then you could probably intercept the keyboard output via MIDI-ox and remap to different channels, set the the different synths to the different channels and put a filter on the channel going to Rapture that would remove the specific controller messages.

On the rapture track, insert the midi fx 'Midi Filter', and select the controller you don't want it to receive.
 
If like me you use instrument tracks a lot, then go to the track inspector, select midi at the bottom, too show the Midi Fx bin

Oh dear! Guess I should stop by more often. I had forgotten that I had asked this question and just asked it again.
 
Thanks for the MIDI filter help. That seems to have done the trick.
 
John