Are you sure you're not just seeing the deliberate delay in some Rio Remote commands?
Some of the commands on the Rio Remote don't execute immediately because the Rio has "hold-down" capability for most of its buttons. Meaning that if you press the button, that's one thing, but if you hold down the button, that's another thing.
In order for this to work, some things have to be delayed slightly. It waits to see if the button was held down before deciding which of the two (potentially confilicting) things to do.
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Tony Fabris