Thanks , looks like Steinberg don’t really care about it as the post was early 2017 and still not a fix. Similar issue works for cubase but not wavelab . I’ll give the aggregate device a go. To me it’s odd Steinberg don’t use the same audio setup system for both products. Looking on the net there are a few posts with the same wavelab issue , different interfaces. If the interface is selectable in OSX as coreaudio it should just work.