I cannot pin-point what may have caused this. Certainly my Roland MX-1 (used as offboard USB soundcrad) seems recognised and loaded up on the Windows system. And is midi synced for when needed. So it appears Caustic also recognizes it is there.
So unsure why, now, after a few years of no issues at all, this happens.
Have 'song' loaded up. And song or pattern mode, 'play'' does not do anything, as though I am not connected to soundcard of any kind. If that makes sense? As that is whatI noticed when first getting used to Caustic years ago.
Win'10. Play inactive when clicked. NO audio
reloaded it a few times, and seems to have resolved itself.
Oh well. Am happy