Unfortunately I think only a few of the PO's support this transfer method, and I don't think the 33 is one of them. They were never meant to be updated at all, as I understand it.
replyMe too, have been trying to crack this for so long!
replyI was able to get part way some years ago by demodulating the bitstream with gnuradio and then making small changes (like replacing one note with the next higher one) and noting the differences. So that is one possible, but probably too inefficient way.
replyI never got close to finishing or publishing anything. Awesome to see this released and I'll have to play with it!