Solid State Logic SSL 18 User Manual page 19

software from entering the SSL 18 Mixer, but audio form 'Outs 7-8' and 'Outs 9-10' will still be sent out of the physical Outputs 7-8 and
9-10. This is desirable if using these outputs for hardware inserts.
An example of when it is useful to use MIX ROUTES OFF: You want to use Analogue Inputs and Outputs 7-8 to connect some
analogue outboard equipment and use this as hardware inserts in your DAW. You would activate MIX ROUTES OFF for both Playback
Returns 7-8 and Analogue Inputs 7-8. This would ensure your signals to and from the piece of outboard are only fed directly, with no
possibility of forgetting to disengage the MON button on Inputs 7-8 (which would cause a doubling of the signal) or accidentally
sending the return (input) signals to other places with the SSL 18 Mixer aux sends.
TALKBACK
SSL 18 features a built in Talkback Input Channel in the 360° SSL 18 Mixer, allowing communication directly to the Headphone mixes
and a feed into the DAW for creative recording/mixing purposes.