Abstract: A user interface for a digital audio workstation provides an overview of the audio signal routing of an audio composition in the form of a node graph. The node graph updates in real time as an audio session is edited. The representation of the nodes on the graph indicates the node type, such as audio input or track, mixer, plug-in, and output, as well as the processing resources assigned to each node. The node graph includes one or more nodes representing submixes that may be adjusted using a mixer channel independently of other submixes or outputs of the audio session. The representation of audio signal flow between the nodes in the graph distinguishes between insert routing and auxiliary sends. The user interface may be used interactively to edit the audio composition by providing a toolbox for creating new nodes and commands for specifying audio signal connections between nodes.