If you are connected with your student/teacher and can hear them speak but not hear them when they play/sing, their device may have built-in noise suppression or cancellation.
This issue is particularly common on PCs running Windows 10 or 11.
To fix this, your teacher/student will need to turn off the noise suppression/cancellation in their audio driver.
To do this, please try the following:
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Under apps, search for Realtek Audio Console.
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Open this and select Microphone Array
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Select Microphone Effects
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You should see Multi-presenter conference call - Change this to OFF
Note: If you cannot find Realtek Audio Console, your device may have a different audio driver. You should look up which audio driver your particular device has and open the settings to look for a noise suppression or cancellation filter.