> Sorry, When I said tone, I meant the same thing as voice. Using your vocal chords to produce a tone at the same time as flapping the r.
>
> I believe I understand what you mean in the 'virki' or 'skerpa' meaning there is no vocal usage in the r's in those examples.

Yes, no use of the vocal chords.

> So both r's in ormr should be rolled? I probably just have a hard time pronouncing that one, it kind of sounds like this when i say it, if i can put it into letters: "ormpr" I get a minute p sound going from the m to the r roll. I shall have to work on that. I may just be being to picky =P

Actually that's a very natural phonetic development and one
that did indeed take place in at least some dialects of ON.
For example what we have in standardized Old Icelandic as 'draumr'
occurs in Old Swedish as 'draumbr'.

In the first chapter of Guta saga we have:

"Fyrstu nat sum þaun saman suafu þa droymdi henni draumbr..."
(The-first night which they together slept then dreamt she a dream.)

In Old Icelandic:

"Fyrstu nátt sem þau saman sváfu þá dreymdi henni draumr..."

(or rather: "dreymdi hana draum")

In the accusative, where there is no r-ending there is no 'b'.
In the next sentence we have:

"Þinna draum segþi han firir Hafþa bonda sinum."
(This dream recounted she to Hafþi husband her.)

OI: "Þenna draum sagði hon fyrir Hafða bónda sínum."

Kveðja,
Haukur