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MusicToReferenceTime gives different results

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Hey there, I am trying to calculate the length of a midi track using the following code:
// calculate duration
MUSIC_TIME mtLength;
HRESULT hr = ciSegment->GetLength(&mtLength); // Get the segment's length
REFERENCE_TIME refLength;
coPerformance->MusicToReferenceTime(mtLength, &refLength);   // refLength is always different
Every time I run this code, mtLength is the same: 336384, but when I convert it to a REFERENCE_TIME using MusicToReferenceTime, I get a variable result. How does this function work? I have read the doco, but it doesn't suggest to me that the result would be different every time. Cheers,

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