How to hear noise in After Effects so I can lip sync and If its possible to Multi cam two compositions

I having a problem with sound because I'm doing like a jib jab effect where you put a picture of someone else head in a video. I'm trying to get them to talk the only problem I can't preview the sound. I tried the Ram preview but it always starts at the beginning of the clip which wastes a lot of time.

Also the way I'm trying to lip sync at the moment is that I'll key frame the mouth to go up and down when the actual person in the clip moves there lips but its hard and waste of time to have to go back and forth between composition. Is it possible to multi cam where one side is the clip and the other is the head.

In your RAM Preview options, check the "from current time" box so playback starts where you are instead of at the beginning of the timeline.

As for the side-by-side workflow, you can place a copy of the pre-comp containing the video footage inside of your animation comp and then open the video pre-comp and lock its comp window (lock icon in the upper left corner). Then click the tab in the upper left corner of the comp window and choose "new comp viewer" to display your animation comp next to the video footage. Then drag the tab for the video comp's timeline to the right side of the animation comp's timeline so they're side-by-side. Since the video comp is inside of the animation comp they will stay synced together when you scrub in the timeline.

HTH