Just hooked up my Musical Fidelity A5 integrated amp, and realized that their remote is really funky. My Sony, Rm-VL-900 learning remote cannot learn the commands. I read something about some remotes have a parity signal, that changes everytime you use a function. All I know is that you can only use one function at a time. If you repeat the learned function, it won't work unless you hit another key and then go back to the original function. Why the ^%$%^ did Musical Fidelity use this method on their remote. It makes it difficult to use any reemote but theirs. I heard the Pronto can duplicate this parity checking. I really would like my Sony to work correctly.