I think Descrete code from Pronto is much easier to find than AV3000.
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They are using different descrete code.
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Like AV3000 the only way to feed descrete code is get another OFA/RS remote (it is 3 digit) and transmitt to AV3000.
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But i guess Pronto is much easier becasue the unit itself has serial cable connect to PC and can download any through this connection.
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discrete codes either exist or don't, and that depends on the device you are trying to control (i.e. a 5 year old Toshiba TV will not have discretes, so you cannot have them on a Pronto or a Sony universal remote). But like you said, since the Pronto is PC programmable, we can upload/download them easily from the PC to the remote, and we can share them. Something that you cannot do with a Sony remote.