In my (admittedly limited) experience, adding audio tracks to a video track that weren't produced together often requires editing. If not for sample rate reasons, content reasons, like extra space for additional video space at the beginning or ending most basically. It seems like in any instances like that, which I would count as "nominal," it would be appropriate to identify those as "modified from" which would seemingly place you squarely into "hybrid" space within the taxonomy of this comment thread.