hi,
yes the basic pattern that devine and stephens found is that the pitch in a word group rises syllable by syllable to the pitch peak, then drops to the end of the word group. i gave given refs in my old pitch model doc (linked above) to the pages in devine and stephens which discuss this and show the evidence, however my copy of the book is back in aust unfortunately. perhaps you can access the relevant pages online in google books extracts (i can’t from france), it’s in the section around p188.
the grave accent (as used nowadays in grk texts) isn’t really superfluous: if such a word (having a grave on the final syll) has a following enclitic the accent would instead be an acute and would therefore have a different pitch pattern. a grave means that the whole word rises in pitch and the pitch keeps rising in the next word (i.e. a grave-accented syll has the highest pitch in that word but a lower pitch than the accented and pre-accented sylls of the following word). refs for this are also in my old pitch model doc.
i say above the grave accent “as used nowadays in grk texts”, because in ancient papyri a grave can be on any syll not otherwise having an accent, suggesting to the reader to maintain the normal pitch pattern of the word group (which, according to devine and stephens, as i said above, rises to the pitch peak then drops to the end of the group) rather than treat the grave-accented syllable as a pitch peak.
i have read in the ancient grk authorities about two key differences between prose and poetry pitch:
(a) aristoxenus says that in poetry the pitches move cleanly from note to note, whereas in prose you bend through all the intermediate notes as well without resting for more than an instant on any note (i.e. the first syll of the iliad would be sung with two notes only, whereas in normal speaking the pitch would slur through all the intermediate notes in between as well). here is a link to the relevant part of aristoxenus:
http://torzsasztal.hu/Article/viewArticle?a=80871481&t=9088651
(the key part is: “τὴν μὲν οὖν συνεχῆ λογικὴν εἶναί φαμεν, διαλεγομένων γὰ? ἡμῶν οὕτως ἡ φωνὴ κινεῖται κατὰ τόπον ὥστε μηδαμοῦ δοκεῖν ἵστασθαι. κατὰ δὲ τὴν ἑτέ?αν ἣν ὀνομάζομεν διαστηματικὴν ?ναντίως πέφυκε γίγνεσθαι· ἀλλὰ γὰ? ἵστασθαί τε δοκεῖ καὶ πάντες τὸν τοῦτο φαινόμενον ποιεῖν ο?κέτι λέγειν φασὶν ἀλλ’ ᾄδειν”).
(b) dionysius of halicarnassus says that some poetry (he gives an e.g. of a chorus line from tragedy) is not sung using the pitches of the words. i can’t find the text online but here is an extract where he says that σίγα σίγα λευκὸν is sung in one pitch even though each of the words has high and low pitches:
“?ν γὰ? δὴ τούτοις τὸ σίγα σίγα λευκὸν ?φ’ ἑνὸς φθόγγου μελωιδεῖται, καίτοι τῶν τ?ιῶν λέξεων [i.e. σίγα, σίγα and λευκὸν] ἑκάστη βα?είας τε τάσεις ἔχει καὶ ὀξείας”.
my understanding of this is that (in strophic music) either in the antistrophe you copy the pitches of the strophe, or that the poet wrote music for these parts changing the pitches of the words.
cheers 