Voice recordings are a nice way to engage students and let them hear the educator’s voice with verbal and non-verbal cues.
Students can also be enabled to submit their assignments as voice recordings.
Many LMS’s (Moodle, Canvas, Blackboard) enable voice recording for audio feedback.
Showbie is an example of a digital classroom which enable feedback as audio files. Flipgrid is an example of audio discussion boards where students can create and post audio and video recordings, or receive feedback by audio or video.
Submitting audio or video feedback in Canvas: Submitting Audio / Video Feedback to a Student | Instructor Guides | Canvas @ Yale
Showbie, a digital classroom enabling audio feedback: https://www.showbie.com/features/
Creating audio discussion boards with Flibgrid: https://info.flipgrid.com/