Hi Mike,
I'm in the 'create separate sessions' camp, not that I'm saying that's best but it works for me.
I usually keep a safety copy of the main mix, then hack at it to create the alternate versions, and I most often work longest to shortest. Sometime's that doesn't give me enough flexibility though, and I have to start with the main version each time.
Working back from the ending is also common method for me. I usually start by placing an end marker at the last audible point and then another marker a minute (or whatever the required duration) back from that. Listening from there gives me some sense of the musicality of the editing point. If I'm lucky, there might be a distinct last verse and chorus or something I can capture and get close to the duration I want. Otherwise, I keep shifting the window and editing the content to get the duration right.
'Tweaking' methods might include:
- adjusting the length of the the last note ring-out fade (whilst trying to keep it sounding natural).
- muting a bar or two of the lead instrument so that the rest forms an intro.
- pasting the intro (or part of it) to the start of a section.
- shortening a verse or chorus to half its length.
- tacking on a riser to gain an extra second or two on the front end.
- converting an outro with ring-out into a simpler final hit.
- etc.....(you get the idea)
The advice I was given is that shorter is better than longer, and by no means should you exceed the length of the time slot, ie its better to submit a 28-second edit with a 2 second ring-out than to send a perfectly precise 31 second piece. 5-second 'stings' can be tougher to get right for that reason, but there will always be some 'wiggle room' if you look hard enough for it. For me, the editing seems to go easier with faster tempo pieces, but maybe that's just me.
Finally, more advice I was given is to keep the mix volume for the edits the same as the full mix. Therefore, I never adjust the track volumes or the plugins once the full mix is finalised. Bus compressors can react differently if you take out some instruments (eg removing the lead instrument to produce a 'soundbed' mix), but hopefully the end is result is close enough because we don't slam master bus compressors do we!
[.....or maybe the EDM guys have something to say here.]
All this used to seem a bit daunting but now I find it another enjoyable part of the process that brings its own creative challenges. Maybe I'm weird, but I get a bit of pleasure from carving a neat 60 or 30-second edit from track that was never created with that in mind.
Anyway, that's my approach at present, but please always take the advice of the more seasoned pros way ahead of mine.
I wonder who edited the 'Friends' sting that none of us will ever get out of our heads? The Rembrandts must be eternally grateful for that one!
Graham (UK). Still composing a little faster than decomposing, and 100% HI.