When a VT is scheduled, you can "Link" it to a surrounding file. In the event that an adjacent song is moved or removed, the voice track will not play. The prefixes are;
JV- Join Voice tracks (similar to JB) - links pre and post cuts to the voice track
JB- Join Both - links pre and post cuts to the voice track
JN- Join none - Does not link pre and post cuts to the voice track
JU- Join up - links pre cut to the voice track
JD- Join Down - links post cut to the voice track