Aggregated device issue...stopped mapping output ports

Hi I set up an aggregated device on my Mac for running Cubase, all working fine till today, suddenly on opening up Cubase I get a message that there are no output ports mapped, there are no options for my aggregated device in the control room panel and yet it all looks fine, still set up as previously on the mac side of things. What has happened and how can I fix it so i can hear sound again??!

Running Cubase 9.5 on Mac with high sierra


In general, none of DAWs support Aggregate Devices (even Apple Logic doesn’t support it officially). The reason is sync issues.

Could you try to set No ASIO Driver and then back your Aggregate Device in the VST Audio System, please?