Sometimes you may want to edit a controller to a specific value, but it is too difficult to move your mouse to the exact pixel on the screen.
For all controllers, besides Velocity, you can right click to add, edit or delete controller information.
The options that will appear on the right click menu are:
•Delete All Controllers
For example, if you want an external synthesizer to switch to patch 67, choose the "Program Change" controller, move to the start of the track, right click and select "Add Controller" from the menu. A dialog box will pop up and allow you to type in 67. Click OK and you will now have a program change #67.