Actually, I don;t have the sound files anymore, but I do have a print out of the Pater Noster (Lord's Prayer) in three Coptic dialects with phonetic transcriptions (IPA).
There are two transcriptions for each; for Bohairic, how it is pronounced using GB and OB pronunciations (the one you'd probably be most intrested in) and for the other two dialects (Saidic and Fayumic) I give a more "classical" pronunciation (more or less like something you'd learn if you were taught the dialect in a university - based really on almost a classical Greek pronunciation - as found in books such as Lambdin's Saidic grammar.
The second transcription is based more on the same principals and rules as OB.
Personally, I think the actual pronunciation of the two dialects fell probably somewhere in between the two transcriptions offered for each.
Anyway - I have scanned the document and attached it here as a pdf doc. I'm not sure how it will appear on your pc, but it looks and prints out on mine just fine.