I have had the same frustrating problem trying the pxs3000 with chordana play and a pedal, and just discovered that it will work if you use the simple pedal that comes with the piano but not with the larger PS-1 pedal I bought.
We'll, I can make the PS-1 pedal work as sustain if I use the assignable input and set it up using the panel on the s3000, but as soon as I start the chordana app it loses contact even though I make the same setting with the app...