I've started playing with my Sony wired remote (attached via the new tuner). Is there documentation regarding what each button on the remote is supposed to do?

I notice that if I use the remote to switch functions (i.e. tuner FM -> tuner AM -> aux -> player), then the tuner forgets the name of the preset station it is set to (the frequency stays where it was, but the preset name is gone).

Also, I've noticed inconsistent behavior. The "decrease volume" button works correctly every time, but I have to tap on the "increase volume" button several times before the empeg seems to recognize it. Although I realize it's possible that the remote is defective, the behavior seems to be more indicative of the empeg simply not noticing the signal sometimes. The same is true of the "next/previous track" buttons. Is there a way for me to test the remote itself (or possibly some debug output I can view on the empeg)?