The issue may be caused by the microphone hole being blocked or covered during recording, or the noise cancellation feature being triggered (DrivePro 20/DrivePro 20B), which can degrade audio quality.
Solutions:
• Ensure the DrivePro's microphone hole is unobstructed.
• Turn off the noise cancellation feature(DrivePro 20/DrivePro 20B.)
For instructions on how to disable the noise-canceling function, please refer to the user manual:
https://tw.transcend-info.com/Manual/DrivePro/DP20B/EN/#4-4-app-settings