Don't warry, VSXs and HDXs are fully compatible, including content sharing.
There is no need to change the resolution on HDX, it will adjust resolution automatically according to VSX receive capability.
VSX doesn't support VGA resolution for people video, its limit is 4CIF (576x704).
WBR,
Mike
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“Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns- the ones we don't know we don't know.”
― Donald Rumsfeld
