Does anyone know if control surfaces with motorized faders have any memory to store fader positions from bank to bank?

For example: using the generic drivers with Vegas5, if I set faders in one bank, then go to another bank and set faders, and then go back to the previous bank, will the control surface remember the prrevious fader positions? Or, does it only set them when receiving position data from the host?

I am looking at several options that may never have specific drivers for them, so this information would help a lot in deciding if it's worth it to purchase.

Also, is it possible the generic driver will ever send data to the controller in a future revision?

Thanks in advance.