As this hope this helps you. In the bottom left of the buttons vMix this recording and you enter configuration settings together and you will get the parameters of your DV recording think it is in the audio portion of this below is the audio section, select the line input your computer (will come with the name of your audio card), say 48k down format, 16 bit, stereo and below this delay, is where you have to delay it, is hard to say how much, but if you use an approximate cards catch you putting your system 100, this is measured in milliseconds (ms), and as you know and stay synchronized? they put a camera to record with a microphone connected to your console is already connected to the audio input of your computer you record applauding front of the camera and by the micro audio must be synchronized, if not so, you will that comes first whether audio or video, if you delay the audio it more like? recording settings you see and put another 150 to record a time more and so on until the recording is synchronized is not difficult matter of judgment, when they have accomplished what saves this configuration, although by default saves vMix.
I hope this helps you somewhat.