I know this doesn't address your question, but this is one of the reasons that I like working with VST plug-ins, which makes it very easy to do various things that would be hard on hardware.
I wonder if you can layer two voices in your hardware and control the strings/pads with an expression pedal.
Wow, VST plug-ins looks great! I will explore it in the enar future. I will look into expression pedal control as well. Thanks a lot!

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'For a day in your courts is better than a thousand elsewhere' (Psalm 84:10, ESV)
Past: Roland (E-10, E-16, E-38), Korg i30s.
Current: Roland BK-5, Kurzweil MicroPiano.