1. On your AR go into the sequencer config and there in the midi sync menu you enable clock receive and transport receive.

  2. On your AR make sure you have the “input from” set to either MIDI, USB or MIDI+USB. This setting is in the midi port config.

  3. In Cubase (if you’re using a fairly modern version) you find the settings for enabling midi clock under the Transport->Project Syncronization Setup menu. In this dialog you have a box with “Midi Clock Destination” where you can enable one or many midi outputs as targets for midi clock.