Re post: Editing-- Insert video and move audio, preserving sync

Question

Forgive me, a newbie, for posting this twice, but I think the iM6 group folks, not the iM8 folks, may have the a clue about this issue.
I really love iM6. I do have FCExp, but I've gotten so comfortable with iM6 that I hate to change. But I am frustrated by one thing.
I may be trying to do something too advanced for iMovie (6HD) but almost everything else with this product is so amazing, I can't imagine that they didn't build this in. I must be overlooking something.
I am making dvds from a VHS conversion of some 60-70s 8mm home movies. A labor of love for an aging parent. The amateur filmmaker used to project them with records playing, and at some point he collected all his chosen LP music onto a cassette (not on the video cassette, a music only cassette). So, I play the VHS and the music at the same time and use an analog to Firewire converter and load all into iM6. So far so good. Then, because I need to seriously mess with the music to put it more or less in sync with the video segments, I extract the audio so it now shows up as a second track. Still no problem. Now in editing I clip or split the audio into separate pieces and checkerboard them, alternating between the two audio tracks in the timeline so I can adjust volumes, cross fade, etc.
The first volume I did took a lot of twiddling and tweaking to keep all the clips in their proper places. I'd work at the end of the piece, then at the beginning then back to the end with the result that the audio clips were always sliding out of position. I can't quite figure out how to keep two audio tracks in sync with the video. BUT I did finally finish and when I started the next one, I swore that I'd always finish a segment and then move on to the next, always left to right, never tweaking the finished stuff to the left (earlier on the time line). This has made the job much easier but I have one big problem now. I did not think to put some black at the head of the project to put the titles on!
You'd think I could just put the cursor at 0:00 and insert a 6 second title over black and it would move all the video and audio to the right by six seconds. But what happens is only the video slides over. The two audio tracks don't move and are now six seconds early. Sure, I could go ahead and re-adjust all the 30 or 40 audio clips, but I can't help thinking that "Apple wouldn't make me do this..."
Has anyone any idea how to lock all the edited material together so I could insert some space to the left without losing sync?
PS does anyone share my frustration on THIS: when I copy a little piece of sound from one of those tracks and then paste the copy, there's no telling where it will land... It never goes to the cursor position. If I'm lucky it lands somewhere on the timeline after the project end and I can drag it back to where I want it. But on an hour project this is annoying.

Answer 1

I think I solved my own problem, and Klaus, you were correct, Lock to Play head is the key.
In order to select ALL the clips on both tracks you click and drag a box across all the clips you want to lock and then select Advanced/Lock Audio Clip at Playhead and all the clips will be locked to their video positions, though in my case only a few of them sprouted little yellow pushpins. I was then able to slug 6 seconds of Black in ahead of my video, and voila!, both video and attached audio moved over staying in sync. I knew Apple wouldn't let me down, though the answer was not explicit in any Apple documentation. I guess I'd better buy the book now.