Multiple tracks recorded, one is found?

[Rectro33]

Hi all.

I have Presonus Studio 26c and a seperate usb Mic. I have followed multiple videos and such as nothing I do works.

Settings/Audio has Desktop audio to mu audio interface as Main out 1.2. this is my speakers. Mix/Aux Audio is set to Mic Samsin CO1U Usb mic.
Output/Recording is set to Mpeg-4, mp4 have tried MKV same results. Video encoder is Nvidia Nvenc H,264, Audio encoder is FFmpeg AAC.
Audio Track has 1 and 2 checked on. should be two stereo channles in the recording.

Advanced Audio Propoties shows both inputs. I set Desktop Audio to track 1 andn Mic/Aux to tracks 2.

In the Audio Mixer I see both audio channles showing and working according to their individual tracks.

I record and when I place back I either get the mic or music never both. In the set up mentioned I hear audio track 1 but not 2 the mic. if I switch the tracks around where the mic is on audio 1 and desktop audio is track 2 only the mic sounds. in playback. Both tracks to 2 both work. Cantasia or powerdirector show any different. one single audio file.

PS: No idea why the strike through it there?

Thanks Dan