I got a ?15 USB cable from eBay and it works fine with the earlier 3xx & 4xx versions of vagcom. Enabling lock / unlock beeps is not a problem! The only thing you might not like, as I have discovered, is that the beep is not synchronised to the locking motion with the actual beep coming in about a second after the locks engage and IMO sounds quite awkward if you are close enough to the car to hear the locks engage.
the alarm beep CAN be done with a third party cable and VAG COM 311 or 409, but if my memory serves me right, you will need to REGISTER the software to allow it to SAVE any changes you make. Its in 46 Central Convenience Module, adaptation and click up and you will see all the options you can change.
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