Hello David,
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Composer gets its key sig information from the midi file it's reading<!-/quote-!><hr size=0></blockquote>That's true when there is key sig information in the MIDI file. When there isn't key sig information in the MIDI file, then Composer deduces it based on harmonies of notes in the MIDI file.
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If one staff comes up in a different sig, is it possible that Composer is transposing it from its instrument transpose table?<!-/quote-!><hr size=0></blockquote>The MIDI file's key sig information is essentially in the conductor's track rather than individual tracks, so this case couldn't happen. It's probably rare that a MIDI file is saved with tracks that have instrument-transposed pitches rather than concert (non-transposed) pitches.
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To me a crotchet is what I feel like at six in the morning<!-/quote-!><hr size=0></blockquote>... And to me, semi-quaver is how I feel halfway through the morning when I've only had two out of my four cups of coffee.
Cheers
-- Mark