Meanings of final 'but'/'so': help needed

[sylh_64]

      hello Geordies
I am a linguist working on Geordie English, and more esp. on sentence-final adverbials such as 'so' and 'but'. I would definitely appreciate your feedback on the following.
When 'but' appears in final position, it looks more like a particle used to show the co-speaker he can speaker; it can be a reinforcement like 'indeed' and 'really' ; and it seems to be never preceded by a comma in the text ( a pause in speech). Tell me what you think final 'but' means.
 Do you have cases when 'but' in this position means a contrast or an opposition?
Likewise, when 'so' is in final position, can it be preceded by a pause in speech or not? What is the meaning of 'so' in this position?
Finally, I would like to ask the same question for 'then'.
Thanks for your feedback
Chee

[Christopher]

Hi Chee,

The "but" and "so" at the end of a sentence are similar to "then" that some Irish people use ... ie "There's your change then" When else would you get your change? These strange words that appear in the final position may have travelled to Geordieland with the ancestors of the current residents.

Christopher