The advantage of using the Flow Graph debugger is that you can see the exact values on particular inputs:
To add a new breakpoint, press the center mouse button on a specific port or right-click on it to bring up the port context menu, and choose the Add Breakpoint option.
To remove an existing breakpoint, either press the center mouse button again or choose the Remove Breakpoint option. The following screenshot shows the port context menu:
Once you have added the breakpoint on a triggered input, switch to game mode.
The breakpoint will be hit and it's value displayed in the Treeview in the Breakpoints window.
To resume the game once a breakpoint has been hit, either press F5 or click on the Play button in the Flow Graph editor toolbar.
Remove all the breakpoints for a specific flow node or Flow Graph, by using the context menu options Remove Breakpoints For Node or Remove Breakpoints For Graph.