Assuming you don’t want or cannot change the MIDI message that your pad is sending, you can use “filters” in Cantabile to block or remap almost any MIDI message before forwarding it to the rack or plugin. You could remap CC7 to CC4 or something else before sending the CC to the rack. If the two sliders on your RD piano are assigned to different MIDI channels, you could still treat them separately in Cantabile, since the filter can be set to act on a specific channel.
You can use a binding to load a particular state but in that case you’d need a different pad for each state. If you have more pads than states, it’s ok.
Gabriel