I don't want to turn this into an argument because I just don't know enough about it. My point is that if the brain knows that A and B are different file types then it is going to be working pretty hard to detect audible differences. If it finds such differences then it is easier to discern them in X because the brain now knows where to listen for them (different phrases, difference notes, different instruments etc). If on the other hand the first two plays in triangle testing are from the same file, then the brain has not prelearnt the cues to pick up the differences on the third play. It would not be surprising if the sensitivity and specificity of ABX and triangle testing are different because of this prelearning.
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