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I have a Xiaomi Redmi Note 6 pro and a pair of black Xiaomi AirDots but every time I call and play music together, the music is as distorted as the call itself like the music's coming from the caller.

How can I undistort the audio?

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You can't.

Bluetooth has many profiles, ie. modes that have different capabilities. When you're just playing music, the phone is using A2DP profile which is optimized for unidirectional high-quality sound. When you're calling someone, the phone switches to HSP profile, which offers bidirectional sound - but allocating some of the bandwidth for microphone reduces bandwidth available for incoming audio, degrading quality. You can't have both because there's not enough bandwidth.

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