My mac volume level won't change after sleep

My "Line Out" (2.1 Speaker System) does not seem to accept volume changing commands either by the Apple Wireless Keyboard, or System Preferences > Sound. This happens all the time after I put the computer to sleep. Before when I switched to Internal Speakers then back it would "unlock" and let me adjust the volume, but that is no longer the case (I should point out that the volume controls are not disabled, it's just that changing the level does not do anything). I can however adjust and use Internal Speakers just fine. This forces me to restart my computer in order to adjust the volume again.

Resetting the SMC and PRAM did not solve my problem, however this did manage to solve my problem across reboots and sleep:
1. Command + Space / Open Spotlight.
2. Search for "Audio MIDI Setup".
3. Select your sound system.
4. Change the format to something else, then change it back.
At this point it should fix the volume level and allow you to change it. I have only done this once, and it has worked since I made this topic.
Let me know if it helps.

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