sometimes the terms can get confused. A trailer is basically a minute
or two long. A sample can be anywhere from a few minutes to, well,
almost any length. I helped produce a doc called "Silverlake Life"
and the sample was almost a half-hour. And very effective, too.
If you have a contact or previous experience with a broadcaster,
sending a cassette out is perfectly fine. If you don't, then a market
like the IFP's is better. But there aren't many like them out there.