The Kent State Shootings Digital Archive, created and maintained by the department of Special Collections and Archives, includes thousands of items selected from the May 4 Collection that have been put into digital format. This digital archive enables you to search for materials in several different ways such as by subject, geographical location, sub-collection, or keyword. It provides a centralized place to browse or search for images, documents, and is a great place to start your audio footage research: http://www.library.kent.edu/may4digital
An easy way to start exploring is to Browse by "Subject Area"and select "Audio recording" from the drop-down menu. In order to hear the audio recording, ensure your computer's or device's speakers are on and volume is turned up.