Kaizena. Whatever you call it, it's a good tool for giving audio feedback to your students.
To use Kaizena you do have to authorize it to access your Google Account. With the authorization step completed you can open any document, highlight a selection of text, and record your comments for students to listen to. John Hardison offers a good overview of the process in the video below.
Applications for Education
I showed Kaizena to a group of teachers today. The conclusion that a few of us came to is that Kaizena may not save you time in giving feedback to students. However, for students who need audio support Kaizena could be an excellent way to provide that support to students while giving them feedback on their written work.