Apple Shake 4 New Features - Manual (Page 22)

22 Chapter 1 Shake 4.0 Interface Enhancements
2 Shift-click the plus sign input of the multi-input node.
All selected nodes are connected.
To insert a disconnected node between two existing nodes:
1 Drag a node directly over a noodle so that both its knots appear highlighted. You can
select which input of a multi-input node to insert by dragging the node to the left or
right, so that the desired input knot is highlighted.
2 When you release the mouse button, the node is automatically inserted.