You don't need to have a DAW - it was working ok for me as a general Win10 soundcard effectively before I managed to resolve my issues with Amplitube, Reaper etc.
Maybe you need to download the Asio4All drivers and then ensure you have the device enabled in your audio control panel? Happy to share screen shots of my setup if you need them.
The only downside to using it as a general audio interface is that certain applications like iTunes will only work when you allow audio exclusivity mode. This should be resolved when/if they release a new driver along with the control software.
It is frustrating though that it's not 100% at launch, I feel that.
Edit: here's a screenshot of my settings:
https://imgur.com/r1cj8jpFinal Edit (lol): The support team have shared this FAQ link with me which should help to resolve my issues around playing multiple devices at once - I will give this a try when I get a chance - doesn't look like something I could have figured out myself:
https://www.ikmultimedia.com/faq/?id=1236