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Hi Carlos – I, too, have done quite a bit of work making sure my courses are compliant and compatible with screen readers, so I’ll offer what I’ve learned in my testing and consulting.
When you choose to hide a text block, it includes the attribute “visibility: hidden” and will not be read by a screen reader, even if “Initially Hidden” is not selected. Screen readers typically do not start reading until the page is fully rendered. I say typically because there may be a setting within the screen reader to start immediately rather than waiting for the page to finish loading.
I’d recommend browsing the WebAim.org site that has a ton of information on 508/WCAG solutions. One specific page is on Invisible Content Just for Screen Reader Users that addresses this to some extent. You can also download NVDA, which is a free (donation appreciated) screen reader that is very similar to JAWS, to do some testing.