Now days, WhatsApp are used frequently because it's convenient, especially talking with your friend via WhatsApp. Do you want to save these voice messages to your computer for backup? Here is a video about extracting WhatsApp Audio Note from iPhone 4 to Mac computer.
iPhone WhatsApp Backup
> Extract, Backup WhatsApp Chat History from iPhone to Computer
> Save Messages, Photos, Video, Audio and Voice Message to Mac
> Recover Deleted WhatsApp Messages, Photos & Videos Easily