[Avodah] Sinai - Rambam - heard all or nothing?

[Daniel Eidensohn]

Rambam in Moreh Nevuchim (2:33) states very clearly that at Sinai they 
heard a sound but did not hear any words. The first two commandments 
were attained by intellectual proofs - not prophecy. In contrast he says 
in Hilchos Yesodei HaTorah (8:1) that the validation of Moshe's prophecy 
was not from miracles but because they all heard Gd speaking to Moshe 
and they understood the words.
Thus Moreh Nevuchim says they heard no words while in Mishna Torah says 
they heard everything that Gd said to Moshe?!

The only attempt I have found to resolve this contradiction is from Rav 
Hutner (Pachad Yitzchok Shavuos 1:2) who mentions that the Sefer 
HaIkkarim had a different text of Hilchos Yesodei HaTorah.

Daniel Eidensohn