sound on my MacBook pro suddenly low

The sound on my MacBook Pro is suddenly low when turned all the way up.  Of course I have set F12 at its highest and the same in Settings-Sound. Suggestions?

MacBook Pro with Retina display, macOS High Sierra (10.13.3)
Has invited:

howapple - hello

Favor from:

1. Reset NVRAM/PRAM couple of times.


2. Reset SMC. Choose the method for “If the battery is non-removable”.

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