Hello dear forum members and - hopefully- new virtual audio friends,

since christmas i am a very lucky owner of a DSI Prophet '08.
I am trying to create a pad sound similar to the one Thom Yorke is playing
at the beginning of Radiohead's beautiful song "Staircase".

Could someone of the experts in sound design please help me with this?
I am not sure if Yorke uses an additional effect for this pad. There's a pedal on his '08....
Sincere thanks in advance from Sibyl, and for the future i hope i can do something for you guys & girls too.