If you are using FonePaw Screen Recorder for Windows, you should fix the distorted sound with the following methods.
Select higher audio quality: On the homepage, click the three-line icon and select Preferences. Navigate to Output > Audio Quality. Select Lossless or Highest quality.
Configure audio channels: On the homepage, open Preference and navigate to Audio Quality. Click Open Sound Dialog. Under the playback devices, select the default audio device and choose Configure Speakers. Set the Audio channels to Stereo.
Select rate and bit depth with higher quality: Go to Preferences > Open Sound Dialog. Under Recording devices tab, select the default audio device and then click Properties. Under the Advanced tab, select a rate and bit depth with higher quality.
Update your audio driver: Go to Device Manager, select your audio driver, right-click it and choose Update Driver Software.
If you are using FonePaw Screen Recorder for Mac:
Select Audio Boost. On the homepage, click the drop-down menu beside the sound icon, then click Options and tick Audio Boost.
If the problem persists, please contact FonePaw Support via firstname.lastname@example.org.