Those steps can help alleviate some of the sound issues in game, however if you're still hearing them don't worry the Apex Legends team is working on them. Sorry for any negative impact it might be having on you in game.
AUDIO KNOWN ISSUES
Issues we are aware of and currently looking into:
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Audio dropouts, where sounds or parts of sounds in the game seem to be missing at times.
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Audio distortion, where there is loud static or mangled-sounding audio that plays, generally during large gunfights and/or heavy concentrations of players.
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Close enemy footsteps being too quiet, or silent, in some situations.
(Source)