Before SSL 2.0, you could modify an XML to override the buttons/knobs on a controller with Native Support in Serato Scratch Live.

After SSL 2.0, it was nearly impossible until I figured you could hijack the MIDI input using the FREE MidiOX software or Bome's MIDI Translater. You would leave the MIDI output alone to get the HID and LED button lights support in SSL.

My interpretation of the previous leaked picture.