Maria –
Should I alternate all audio clips sequentially between 1/2 and 3/4?
No need. That’s a film mix technique and the nature of digital video makes it unnecessary.
Should I only pull clips down to 3/4 if I need more than a simple built-in crossfade?
In general, Yes.
I’ve read some places that people separate out indoor and outdoor sync sound onto different tracks. Is that necessary?
It’s an option, not a necessity. If you have distinctly different sets of audio sources, then assigning each type of audio it’s own tracks can have advantages. It makes setting global filters and settings for each group of audio clips easier. On the other hand working in a timeline with 12 or more tracks can be very cumbersome. It’s an individual choice based on operator ease.
Herb Sevush
Zebra Productions