That suggests that your Finale audio driver and your computer sound driver/card are set to different sample rates. Set them both at 44.1K or 48K and your files should play back in tune.

Until 25.3 (?), Finale locked the System Audio to 44.1kHz. This caused major problems with other apps (Dragon Dictate comes to mind) that locked System Audio to 48kHz. I had to reboot every time I switched between the two and could not run both simultaneously. Well, Finale now runs over 44.1 or 48 and DD for Mac no longer exists,

Depending on your installed apps, there are a few places to check and set this beginning with Audio MIDI Setup.app in your Applications/Utilities folder. Many apps have additional ways to set this. As Adrian suggest, you want everything on your Mac using the same Sample Rate (or sandboxed so that the app uses a different rate only when active—many DAWs can do this).

In addition, there’s a long standing issue that MakeMusic has not fixed. Export Finale audio to .aiff can cause CoreAudio to glitch badly requiring a reboot to clear up. Exporting to .wav instead does not cause this problem.. 

Thanks to both of you.

I reset the audio (after trying a couple of other fixes from the Knowledge base) and that solved the problem. It was clocking at 44 originally as I recall...but now it doesn't seem to matter whether it's 44 or 48. As long as it plays back on pitch.

I'm also on a new MacBook so I got a couple of curves thrown at me.