To hear the recording more clearly, you can tap the Browse icon and enable Noise Reduction to reduce the recorded background noise during playback:

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This feature is currently available only on A16 / M1 devices or later:

iPad Pro (11-inch, 3rd generation) (2021)
iPad Pro (12.9-inch, 5th generation) (2021)
iPad Air (5th generation) (2022)
iPad Pro (11-inch, 6th generation) (2022)
iPad Pro (12.9-inch, 6th generation) (2022)
iPhone 14 Pro / Max