We describe a set of tools to support navigational hypermedia linking within audio (‘branching audio’) and between media types including audio. We have adopted an open hypermedia approach, with a component-based architecture, and aim to be compliant with the emerging Open Hypermedia Protocol (OHP). Content-based navigation is supported and we have focused on speech and musical content for our case studies. Although our investigation concentrates on audio, many of the techniques are generic and therefore applicable to other temporal media.