Midi and Audio Recording simultanesously

Im playing midi through a keybord to a virtual instrument in Nuendo 13. I record midi on midi track and simultanesously sound from virtual instrument on a audio track. Result is a midi and a audio clip that are sort of grouped (but not shown as grouped in the normal clip group way). When I chose midi or audio clip, both are selected. I can not rename audio und midi clip independently. When I chose the clip in pool, I see an audio file with the name of the midi clip, but on the harddrive the audio has another name (rec…) Why is that? Can I change that behavior?
Thanks for help
Oswald