AMVR vs Eyglo / Esimen Noise Isolating Earbuds for Oculus Quest 2 Review 

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No, they are independent and the Quest 2 will always use the mic on the headset.

Through the volume buttons on the headset. They don’t have separate controls

just use normal over ear headphones

None that attaches to the Quest. As ChrisSquid said, just use normal over ear headphones. Look for ones that have the ability to swap their input cable so you can get a shorter cable. Depending on your Headstrap you might find over ears will not fit well. The BOBOVR M2 is a great head strap for over ears.