Good morning LonnyE24,
Welcome to the Apple Support Communities!
I understand you are having issues with the playback on your MacBook Air. Are you asking about the keys on the keyboard or the buttons that you click in an application like iTunes?
If you have not already done so, please update to the latest version of macOS Mojave, which is currently 10.14.4.
How to update the software on your Mac
If the issue still persists after the software update, try resetting the SMC on your Mac.
How to reset the System Management Controller (SMC) on your Mac
Take care.