For this puzzle, it is GIVEN that the first group of numbers are 45 29.???, so the F#octave thingie has to map to a "9" in whatever cipher is used here. so that cipher makes sense, at least that far.

But I'm still getting in trouble with the second group of notes -- something is not quite right there. The solution of "75 36.243", which is what the cipher thus far might suggest, is wrong (puts things in a very very wrong location).

So the "C" note is strange, and I suspect the note after it is also incorrect. But if the "C" were really an "E", and the note immediately after it were a "F#octave", then we would get 75 31.943, which is EXTREMELY plausible in real life.

But.. are those two notes plausible musically?

Cheers