When I render a Magix AVC or HEVC MP4 file and click on audio properties I see options for Stereo audio only. The 5.1 surround is not an available option and after i render the playback file it is in stereo. When I play the project within vegas the 5.1 surround is working correctly within my editing environment. If I render in Windows media Video the option for 5.1 is available and the rendered file plays back in surround.
I am running windows 10 64bit using Vegas Pro 18. I have integrated realtec audio hardware.