Vocal positions are the positions you place things like your jaw or tongue in order to do a certain accent. Position movement is just the manner in which you move those parts, like moving the tongue blade towards the soft palate to get a retroflex "r" sound.
sounds kind of complicated. However -- I have a trick for a "mexican spanish" accented English. Make your d's sound like "th" and emphasize your vowels like Spanish vowels and confuse b's and v's. There's more, but that would be a start.
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