Hey W4U! How you doing?
As W4U said, argon gas infill does nothing for sound attenuation in a window. It is for energy considerations only.
Also as W4U said, your best bet would probably be to get a laminated glass storm window, preferably interior installation, for sound control...in your current situation.
Your current 7/16" glass spacing in the IGU isn't the best for sound control, unfortunately. Sound control windows would generally require a much wider air space or else laminated glass as mentioned.
Just for a bit of trivia, windows with laminated glass called "Keepsafe" (no matter who actually made the laminated lite, or who the window company is) consists of a .060" Saflex PVB interlayer and "Keepsafe Plus" is a .090" interlayer. For comparison, a typical car windshield has a .030" PVB interlayer.
Saflex is a type of PVB interlayer manufactured by Solutia, which is a spinoff of Monsanto. The other type of PVB interlayer generally used in North America is called Butacite and it is manufactured by DuPont.
Finally, as W4U well knows, I can get VERY wordy and in depth (to the point of near-death experience), but if you have any interest in actual window sound performance issues or data, I would be happy to try to help. As usual, W4U's answers are precise and right on the money.
Have a great day!
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