Alot of times in Tabs you'll see "ghost notes" mentioned, well their is no hard and fast rule to explain what it is, I think alot of times the transcriber uses that term to describe any note or notes that they can't hear well enough to distingush, it can also mean notes that sound or ring unintentionally, basically just another one of those vague terms that could mean 20 different things to 20 different people, just have to listen to the piece that was tabbed and decipher the meaning..........