I haven’t read anything about it, but isn’t sigma supposed to be pronounced “sinma”, or “sima”? After all, gamma before my becomes nasal.
Thanks. And… hello everybody 
It’s been a time since I posted something here.
Surely you mean “nu” instead of “my”.
I do not know about the pronounciation of sigma.
And it’s good to see you back 
Probably Mu.
Gamma plus velar becomes Nu.
I had not heard that Gamma before Mu becomes nasal, but that does not mean that it is not true.
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Well, I guess it is Gamma before velars and nasals. Thanks.
(I should have written "Gamma plus velar becomes nasal not Nu)
It looks Pharr is totally wrong, at least as concerns γ before μ and ν. It is clearly a “g”, and in Modern Greek became a voiced χ. Maybe this was also the case in Old Greek.
I’m relying in Pharr only, that’s why I wanted to ask 
That gives us reasons to be here and makes us proud. To correct wrong assumptions; by Pharr, Alen et al. Better rely on us-
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I am curious to read those evidences, please quote them here, if it’s possible. To me, it sounds absurb. Gamma before mu can stand only as gamma, or be redued to a double mu, than spoken as mu. N before M is unstable. In your examples, there we have a vowel between G and M, which became silent and G turned to M. Do not get confuse with γκ, γχ or γγ, this is a different case. In cases where G before M is a nasal NG (not many cases, I can think none at this moment), soon we saw a double M. In any case, σιγμα is pronounced sigma.
Yeah.
In a few minutes I will be leaving to attend that great Madison Tradition, “Taste of Madison” which I myself call “Taste of Pork on a Stick.” So more evidence will have to wait until this evening.
However, I would take it as a great kindness if in that time you actually present the evidence for your case, with examples rather than assertion. I would also like to know how you account for the fact that the nasal sound in -γγ- ended up with the name ἄγμα.
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In the Greek Church and when reading the Bible (both Old and New testament), they kept ancient words and we can follow its pronunciation. GM stood always as GM.
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συν+μαθητης =συμμαθητης never συνμαθητης
συν+μαχος=συμμαχος never συνμαχος
There are no words with NM.
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Let’s try this: When the very few kids who were getting any kind of education were learning the letters of the Greek alphabet, how do you think they called σίγμα? 
Mmmmmmmmmm…pork…mmmmmmmmmmm.
But seriously folks! I learned sigma pronounced with the G sound. Although αγγελος was always pronounced angelos. Of course…I learned Koine first, so I might just be of no help at all.
Perhaps William, belly full of pork and pints, can shed some more light on this for us.