When audio is exported or listened to in-Notion, this score plays about 90 cents flat (because it is slowed down, well below the indicated 100 bpm).
This does not seem to be a problem on some other scores. Attached are the notion file and the mp3 (which sounds the same as and as slow as the wav file).
Note that this score was created on iOS, which also is slow when rendered, but the version here is from Notion 6 for macOS Sierra on a 4yo Mac Book Pro.
http://answers.presonus.com/?qa=blob&qa_blobid=3120814913969054396
http://answers.presonus.com/?qa=blob&qa_blobid=6961449516829752957