Sync audio clips in video
I have a service in a church I videoed. Since my DSLR can only capture 30 minutes at a time, I have 4 video clips, each with probably 1 or 2 second gap with each clip. Then, I have an audio recorder I placed up on the podium which captured the whole service at once. In most cases, this is better than the camera audio. Then, the church recorded about 8 audio clips 10-15 minutes each, with no delay between each, as far as I know.
My question is how do I sync these up? Remember, 4 video with gaps, 1 audio track with no gaps, and about 8 clips of superior church recorded clips.
I did get the audio tracks synced up (the 8 clips all went on different tracks) with merge clips, and I got the first video to sync with that, but don't know what to do with the other video clips. If I selected more video clips, merge clips was grayed out.
Maybe I am going down the wrong path. Any help appreciated.