I have a movie studio project with an MP4 file imported; a video camera file with a video track and stereo audio track. I need to add another audio track on top of the MP4 tracks, which will be a vocal singing track recorded live with a microphone, connected to the PC with a USB audio interface. I want to record the vocal live while the MP4 file is being played in Movie Studio. The USB interface is an M-Audio 192/8 24-bit 2 IN 4 OUT device. The microphone is connected to that and is heard well with monitor. The PC is Win10 64bit. The software is Movie Studio 2023 Suite. The PC recognizes the USB audio interface as an Input and Output device in the Sound system settings, all drivers are installed properly. The Movie Studio software does not recognize the audio interface as a recording source or anything. With Movie Studio 16, it recognized the device but the audio track was corrupted and out of time sync. Then after a few more attempts, the software just crashes. I thought that upgrading to Movie Studio 2023 would help, but it is even worse. Any help would be appreciated, this is what I need the software for, to edit camera files and overdub vocals live. I must emphasize that I do not want to record a separate audio file alone, and then add it later to the video. I want to do it live in sync with the MP4. Thank you.