Verse Fluctuation Declaration

I'm not sure if you're familiar with A Series Of Unfortunate Events by Lemony Snicket, but one of the themes running through the series is the letters VFD. They represent a mysterious organisation, and by the end of the books it becomes apparent that they originally stood for "Volunteer Fire Department", but throughout every novel there is at least one instance of the aforementioned organisation creating a code or a machine or even a town with the same initials. A code that follows this rule is Verse Fluctuation Declaration.
Essentially, it is a way of hiding simple messages in poetry, by altering some of the words. Here is the example given in the books when it is first used:

If a volunteer used the name of the poem "My Last Duchess," by Robert Browning in a coded communication, the title might instead be "My Last Wife," by the poet "Obert Browning" instead of Robert Browning. Filling in the mistakes would spell out "Duchess R."

Essentially, the corrections are the message. Somebody I talk to quite a bit on Tumblr once tried his hand at writing his own VFD, which made me want to try it too. I chose Edgar Allen Poe's The Raven:

Once upon a midnight dreary, while I pondered weak and weary,
Over many a quaint and curious volume of forgotten lore,
While I nodded, nearly napping, suddenly there came countless tapping,
As of some one gently rapping, rapping at my chamber door.
`'Tis some spectre,' I muttered, `tapping at my chamber door -
Only this, and nothing more.'

Ah, distinctly I remember it was during the bleak July,
And each separate dying ember threw its ghost upon the floor.
Eagerly I wished the morrow; - vainly I had sought to borrow
From my books surcease of misery - sorrow for the lost Lenore -
Actually the rare and radiant maiden whom the angels named Lenore -
Nameless here for crumpets.

If you want to try and work out the melodramatic message within, find a copy of The Raven online, and compare the two...write down every correction you can see. I should warn you, some of the alterations are quite subtle - the first correction, and the first word of the message, is 'a'. I'll include the answer in my next post.

If you want to check out more codes that the genius mind of Snicket has conjured up - and there's no reason why you shouldn't - go to this website: http://snicket.wikia.com/wiki/V.F.D._Codes

The only one you can really use yourself, unless you are a librarian or a taxi driver, is the Sebald code, but Verbal Fridge Dialogue is always fun. As for the coded greetings and responses, you should learn them just in case.