maybe it's in front of my nose, but i looked inside out and cannot make a user with editor level post embed codes,
- in a single installation this is not an issue, as the editor has this right by default
- i disabled the visual editor
- disabled the media settings "auto embeds"
- disabled the writing settings "correct invalid xhtml"
- disabled all plugins
- am running twenty eleven
yes, i know there are modern ways to embed, but it's a non-conventional one
youtube used as audio player