It's highly unlikely that you've actually read the information from the sticky post.

By watching the RME tutorial videos and following my step-by-step setup guide for a recording interface on the blog, you should be able to create a simple routing in Submix mode.

I'm not sure how many times it has been described in the forum, but routing in "submix mode" is really straightforward.
Just click on an output and adjust the input and software playback levels as desired.
Every HW output has its individual submix and my consist of channels from
- top row (audio from hw inputs, with near zero latency)
- middle row (sw playbacks, audio from computer/applications with the latency over usb/..).
Audio to the HW inputs is per default passed unchanged to the application.

Of course, we can always post the instructions again and again, but it becomes inefficient and also much time consuming over the years. That's why I asked for a sticky article where this is briefly explained and where all helpful information sources are listed: the videos, the step-by-step guide, and the manual.

It's important to take the time to go through all of that and follow the instructions.

For the "impatient" ones who don't want to read the manual anymore:

- see my short comments at the beginning and in the sticky
- watch the videos to get a preliminary understanding, as it provides a visual demonstration,
- work through my step-by-step guide for a functional basic setup,
- and then do yourself a favor by simply skimming through the manual.

The manual is excellently structured, with the most important information up front and progressively more detailed explanations later on.
When someone invests in an expensive product, it's reasonable to expect them to familiarize themselves with its features.
Once you grasp the fundamental principles of operation and Submix mode, you're already on your way to success.

I know it from own experience. When I started with RME UFX I watched the videos, this made it easier to read and understand the manual, the implementation of a basic setup went smoothly after the device was delivered.
One additional step on Windows: setup of WDM devices for your monitor for OS and applications which do not support ASIO and to make it in the Windows sound settings as the default sound device.