This mod was created by Backtrack, a member of my forum. It's designed to give the PDX-2000 the MIDI functionality of the PDX-3000.
Here's an early demo video, although the notes aren't pitched to a scale at this stage - the pitch is just stepping up and down in set intervals: -
He's completed the mod now - here's the final product: -
It's handy for people who make music via turntables.