keep audio and video connected but hide video in fcpx timeline

Here's my problem. I keep an original track in my timeline, for reference, so I can be sure that the music in the performance I'm working on is ALWAYS in sync. As soon as I detach the audio from that original track, it tends to drift and cause problems and it no longer syncs with the reference track (or anything else.). I want to keep that reference track at the bottom of my timeline for both audio and video referencing, but sometimes I would like to hide the video. The only way to hide the video is to detach the audio and then disable video. But then the audio inevitably goes out of sync and I can't wed the two tracks back together. Suggestions please for hiding the image at will when I need to?????? But still keeping it firmly attached to its audio track?