Follow the same steps, but connect the FocurRite audio outputs to the 'Line In' jack on the DP. If the DP _does_ have a 'Line In' or 'Audio In' : Turn off 'Local Control' on the DP - it should be a menu option. drive external 'powered' or 'active' loudspeakers. Use headphones on the Focusrite, or use its 'Line Out' jacks to and take its MIDI input from the DP (these are set inside Pianoteq) Arrange Pianoteq to play its audio through the FocusRite interface, MIDI signals are coming in from the DP, on that USB cable.
and do whatever is needed to get the computer to recognize that
As MacMacMac says, connect the DP's USB port to the computer, If it _doesn't_ have 'Line In' or 'Audio In' jack, you _will not_ be able to play Pianoteq through its loudspeakers. Does it have a 'Line In' or 'Audio In' jack ?