One or more digital audio systems, such as a digital audio workstation, and one or more digital video systems, such as a video server, are interconnected by a computer network. A communication protocol among the systems using the computer network enables the systems to play back in synchronization. The communication protocol defines several states for connections between systems. In particular, two systems may be disconnected, connected and unlinked or connected and linked. Each system transitions through defined state changes that are caused by a sequence of commands in the communication protocol, called a play start sequence, to initiate synchronized playback. The play start sequence can be initiated by any of the linked systems. The communication protocol includes a mechanism for distributing a running time clock from the digital audio system for synchronizing with the digital video system when the digital audio system and digital video system are not both synchronized by the same video reference signal.
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