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Audio playback too slow! Help

I’m in builder. The audio files (.wav) are playing back too slowly. They are so slow that they’re a whole note lower than they should be (for example, if the song is usually in the key of G major, it’s now in the key of F major). It is of crucial importance to my experiment that the songs play back at the correct speed.
I’m on a Macbook Pro, Mac OS Sierra latest update (10.12.4)
I’m running the the latest version of PsychoPy.
In PsychoPy, audio library is set to [‘pygame’] and audio driver is set to [‘coreaudio’,‘portaudio’].

How to even begin fixing this?

Problem solved. Make sure all your .wav files are at 44.1 khz, not 48 khz!