Ah, fallback([]) with an empty list is one way to define a source that
will always fail to produce anything. That can be used sometimes,
though not often. It is used for example in:
def once(s)
sequence([s,fail()])
end
This is a function that takes a source and returns a source that will
relay the first track of the initial source, but become available
after it. The once() function is useful in transitions, to produce
only one jingle from a jingles source.
That was short, but I hope it helped,
--
David
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