This document discusses research into using audio feedback to provide formative assessment to students. It notes that audio feedback may allow for more detailed feedback to be given more quickly than written feedback. Previous research on audio feedback has been inconclusive about whether it enhances the learning experience. The authors conducted an exploratory study of audio email feedback to evaluate its impact on the formative learning experience. They found that students generally found the audio feedback clear and helpful. It allowed feedback to feel more personalized compared to written feedback. However, audio feedback also has some limitations such as not being searchable and potentially issues with accessibility.