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In comparison to instructional videos, the role of audio-only instructional content in online learning has received scant attention. When audio-only content is discussed, the research often centers on the use of audio feedback or student-created podcasts, rather than instructor-created instructional audio. Additionally, few studies have compared learning outcomes from recorded video lectures versus from audio alone, except within the context of specific disciplines, such as second language acquisition (Berner & Adams, 2004).

Universal Design for Learning (UDL), which has roots in Ronald Mace’s concept of Universal Design, is a pedagogical framework that supports diverse learning needs. According to CAST, the creator of the framework, UDL seeks “to improve and optimize teaching and learning for all people based on scientific insights into how humans learn” (2018). UDL is not a step-by-step curriculum plan, but rather an approach to pedagogy and curriculum development that aims to make the learning environment as accessible as possible for as many learners as possible (Derer, 2021; CAST, 2018).