Daw mode only works with studio one at this moment.
Update firmware of SL mixer and studio one version to latest.
Connect mixer and computer via
USB and Ethernet to network switch or router.
Fire up studio one
On SL mixer, go UCNET, you should see studio one is available over the network there. Choose it, then press the green daw button
Route audio output of studio one to aux1 l/r and on the SL mixer, dial up aux1 input to main then you are good to go.