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I have come to the conclusion that communicators must present to different audiences in different formats. Slides used in public speaking are no different from hand gestures. Slides posted online for the same speech have to be touched up or completely redone for the new online audience. The audience who heard my speech might benefit from having a copy of my slides as memory cues.

The only good way I have seen it handled without a lot of duplication or extra work is to have the speaker's own notes as a handout, and the presentation just for the audience. Of course that takes a little planning up front.

Good talk, watched it a few weeks ago, still trying to work out how to solve dependancies on my application in an extensible easy to hand over to other devs way.

Consider, then, not referring to your slides as expository material. Instead, add paragraphs to further develop the discussion.