scook
When the Cakewalk help file refers to online help, it means a separate help file on your PC. In the case of the TL-64, the default location for the 64bit versions help file path is "C:\Program Files\Cakewalk\Vstplugins\Tube Leveler\TL-64_Tube_Leveler.chm"
Here's a quick trick to enable quick access to sonar's helpfiles, inside or outside Sonar :
1. Create a folder somewhere and call it something like Cakewalk Help Files.
2. Point Windows Explorer to your Cakewalk root directory
3. In Explorer's search box type in *.chm
4. Hit Ctrl-A to select all the results
5. Ctrl-Shift drag them all into the folder you created in Step 1.
6. Your folder will now contain shortcuts to all Sonar's help files.
7. You can then create a TaskBar toolbar that points to this directory and you'll have quick access to your help files at any moment
8. You can organize your shortcuts into some nested folders and the toolbar will automatically reflect this
9. I've added shortcuts to all my manuals (.doc and .pdf, like the X2 Reference Guide) as well in this toolbar.