I am looking to buy a used Panasonic WJ-MX50 video mixer for recording of church services. I am trying to make sure, though, that I can hold one audio feed through transitions of multiple video feeds. I've looked at the users manual online but it doesn't sepcifically say this would work. I run the only audio feed from our sound board into our current (cheap) mixer but when I crossfade between my video sources, the audio fades (out then back) with the video. I just want to make sure this mixer won't do that. Any comments on this mixer would be appreciated. (hopefully this is the right place for this equipment/question)