Adobe Audition
Adobe Audition is available as part of the Adobe Creative Cloud subscription. It works well with Premiere Pro for editing the audio in your videos.
If audio descriptions have not been integrated into the speakers' original audio, you can add audio descriptions to an alternative video.
Be sure to share both versions of your video: the original and the version with audio descriptions. Clearly identify each version so your audience members can choose the correct version for their needs.
Adobe Audition is available as part of the Adobe Creative Cloud subscription. It works well with Premiere Pro for editing the audio in your videos.
Audacity is a free desktop app for audio recording and editing. It is available for Windows, Mac, and Linux.