To delete a connection (Method 1)
To delete a connection (Method 2)
The lines are deleted and the swatches in the Node Editor update to show the changes.
To delete a connection (Method 3)
 +
 +  + drag to draw a line in the Node Editor. Release to delete the connections crossed by the line.
 + drag to draw a line in the Node Editor. Release to delete the connections crossed by the line. 
             Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
 Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License