How to record system audio using RME TotalMix

Those owners of RME sound cards (such as RME Fireface UCX) who want to make screencasts, often face the problem of recording system audio. For example, when one runs a DAW (digital audio workstation) and tries to record both video and sound of a playing project, he/she finds out that audio is not recorded, just video.

There is a universal software mixer for RME sound cards – TotalMix, which can be tuned up so that one can record audio too. I show how to do that in my video here.