Routing for iMac Workstation #1 Audio:

The routing for this has been updated to accommodate the additional rear speakers. As such the audio is now sent from: 

Computer -> Audio Interface -> Speakers

So to listen back to the computer audio on headphones please plug into the Scarlett 6i6 Headphone sockets.

The outputs from the Keyboard has also been routed through the interface on inputs 3/4. So for keyboard playback via the speakers please ensure the interface, speakers and keyboard are turned on and the monitor volume is up on the interface. 

You can still use the keyboard at WS 1 with headphones by using the keyboards headphone socket (this also stops audio going to the keyboards speakers).