Why is the volume on my MacBook Pro suddenly so low?

The volume on my macbook pro is really low.  It used to be much better, now I can hardly hear people when on skype or listening to music... everything is set on high volume... help!?!

Try:
Reboot into Safe Mode then reboot normally. Safe mode takes longer to boot than booting regularly. That is normal.
Intel-based Macs: Resetting the System Management Controller (SMC)
Resetting your Mac's PRAM and NVRAM
Open Activity Monitor in the Utilities folder.  Select All Processes from the Processes dropdown menu.  Click twice on the CPU% column header to display in descending order.  If you find a process using a large amount of CPU time (>=70,) then select the process and click on the Quit icon in the toolbar.  Click on the Force Quit button to kill the process.  See if that helps.  Be sure to note the name of the runaway process so you can track down the cause of the problem.

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