G-d's Audible Voice

Since I began the study of the Tanach (the Jewish Bible), in the spring of 1972, the most controversial question I came across was “Did G-d speak to the entire congregation of Israel in an audible voice or use Moses as a mediator, at the foot of Mt. Sinai, when He gave them the commandments for the first time?” This is what I have found in my research concerning this question.
Circumstances:
From the beginning of the Hebrew nation, the covenant was between G-d and Abraham. This was called the Patriarchal Covenant. Abraham was the first to formally convert and was circumcised as an individual (Gen. 17:10-14).
It was not until the Jews departed Egypt and arrived at Sinai that the whole people converted formally (Joshua 5:1-7). This was the beginning of the Sinaitic Covenant.
According to Exodus 19, Israel had been traveling for three months in the wilderness, when they came to the desert of Sinai and camped before the mount (Ex. 19:1-2). Moses went up unto G-d, and the L-rd spoke to him out of the mountain. G-d told Moses that if Israel obeys His voice and keep His covenants, that they would be a special people to Him above all other nations. They would be a kingdom of priests and a holy nation (vs. 3-6). Moses returned to the camp and told the elders what G-d had said and they agreed to obey (vs. 7-8). When Moses returned to the L-rd, G-d told him that he would appear to him in a thick cloud, “that the people may hear when I speak to them and believe the forever” (vs. 9). Now G-d commanded Moses to tell the people to cleanse and sanctify themselves for in three days the L-rd would come down in the sight of all the peopled upon Mt. Sinai. Boundaries were set by the L-rd as far as how close the people and animals could come to the mountain and if anyone or anything would cross those boundaries they would die. They were told that when the trumpet sounded long that they should come up to the mount (vs. 10-15).
Now on the morning of the third day, thick clouds, thunder and lightening appeared on the mount. The trumpet sounded so loud that the people trembled. Moses gathered the people out of the camp and they waited at the food of the mountain (vs. 16-17).
When though the people were afraid, they had dedicated themselves earlier in the chapter to follow the will of G-d. So here they stood as one people prepared to face G-d, with the express purpose of receiving His Law.
Now as G-d descended upon the mountain, the whole thing was engulfed in smoke because the L-rd descended as fire and the whole mountain quaked greatly (vs. 18). It says that when G-d descended, Moses spoke and G-d answered him by a voice. G-d called Moses to the top of the mountain. He told him to remind the people not to come any closer up the mountain or they would die. After Moses went down the mountain and gave the people the message, he was to return with Aaron (vs. 19-25).
Exodus 20:1 says “And G-d spoke all these words, saying:….”, followed by a listing of the Ten Commandments (vs. 1-17).
As the people are standing at the foot of the mountain they see the lightening, and hear the thunder and the sound of the trumpet, and they see the mountain smoking they are beginning to become afraid and started to back away. The people told Moses that if he speaks to them, they will listen, but do not let G-d speak because; they did not want to die. Moses reply was that they shouldn’t worry. G-d was just testing them and reminding them that they shouldn’t sin. Then Moses drew near the thick smoke (vs. 18-21). In verse 22 G-d speaks to Moses and says that he should tell Israel, “You have seen that I have talked with you from heaven.” And then he begins to elaborate or explain in more detail the commandments (613 Laws).
Scripture references:
The following information is scriptures found throughout G-d’s Word pertaining to the events at Mt. Sinai.
Deuteronomy 4:10-15, 33, 35-36.
10. Specially the day that you stood before the L-rd your G-d in Horeb, when the L-rd said unto me, gather me the people together, and I will make them hear My Words, that they may learn to fear Me all the days that they shall live upon the earth, an that they may teach their children.
11. And you came near and stood under the mountain; and the mountain burned with fire unto the midst of heaven, with darkness, clouds, and thick smoke.
12. And the L-rd spoke unto you out of the midst of the fire; you heard the voice of the words, but saw no similitude; only you heard a voice.
13. And He declared unto you His covenant, which He commanded you to perform, even Ten Commandments; and He wrote them upon two tables of stone.
14. And the L-rd commanded me at that time to teach you statutes and judgments, that you might do them in the land whither you go over to possess it.
15. Take you therefore good heed unto yourselves; for you saw no manner of similitude on the day that the L-rd spoke unto you in Horeb out of the midst of the fire:
33. Did ever people hear the voice of G-d speaking out of the mist of the fir as you have heard, and live?”
35. Unto you it was showed, that you might know that the L-rd is G-d; there is none else beside Him.
36. Out of heaven He made you to hear His voice, that He might instruct you; and upon earth He showed you His great fire; and you heard His words out of the midst of the fire.
Deut. 5:
4. The L-rd talked with you face to face in the mount out of the midst of the fire. Face to face implies a direct personal relationship.
5. I stood between the L-rd and you at the time to show you the word of the L-rd, for you were afraid by reason of the fire, and went not up the mount. (Moses is seen as a mediator on several occasions. Here he is the one who interprets to Israel the voice of
G-d, which they could hear (4, 22-27) but apparently could not understand.)
22. These words of the L-rd spoke unto all your assembly….and He added no more. And he wrote them in two tables of stone, and delivered them unto me.
23. And it came to pass, when you heard the voice out of the mist of the darkness, (for the mountain did burn with fire), that you came near unto me, even all the heads of your tribes, and your elders.
24 And you said, behold, the L-rd our G-d has shown us His glory and His greatness, and we have heard His voice out of the midst of the fire, we have seen this day that G-d does talk with man, and he lives!
25. Now therefore why should we die? For this great fire will consume us, if we hear the voice of the L-rd our G-d any more, than we will die.
26. For who is there of all flesh, that has heard the voice of the living G-d speaking out of the midst of the fire, as we have and lived?
27. Go you near and hear all that the L-rd our G-d says, and speak you unto us all that the L-rd our G-d shall speak unto you, and we will hear it and do it.
28. And the L-rd heard the voice of your words, when you spoke unto me; and the L-rd said to me “I have heard the voice of the words of this people, which they have spoken unto you; they have well said all that they have spoken.
29. Oh that there were such a heart in them, that they would fear Me, and keep all My commandments always, that it might be well with them, and with their children forever!
30. Go say to them; get you into your tents again.
31. But as for you, stand you here by me, and I will speak unto you all the commandments, and the statutes, and the judgments, which you shall teach them, that they may do them in the land which I give them to possess it.

When I first found Deut. 5:4-5, I was a little confused. It did not seem to fall in place with the others, especially verse 5. As I read it again, I noticed that the word to “show” was being translated as to “explain”, in the references under the verse. It seemed to make more sense now.
The book of Deuteronomy Summary:
While doing this research a number of Pastors, Rabbis and lay people were asked the same question, “Did G-d speak directly to the assembly or use Moses?” The answers were for both sides and some would not commit. They just said they need to study the Scriptures more.
Even in checking the commentaries, it went both ways and some did not even touch the issue.
Well the Scriptures are before you. What do you think?