Hello,
I have 3 Sony Players in my AV system (a 5-dics, a 300-discs and a dual deck CD Recoder). I have a Sony RM-AV3100 remote to control them. How can this remote control all 3 players (independently)?
Thanks.

Don't believe it can be done unless the ORIGINAL remote and CD players support different codesets.

More likely, you'll need an MX-850 with MRF-250 so you can assign an IR flasher separately to each CD player.

The MX-350 would work too but much less capable and not pc programmable.

If you can take the 3100 back, do so at once - much better solutions are out there.

My buest guess without the model numbers is you can't do it. Just one prime example of a problem is the play button is the same IR command. You could get a Xantech IR router and cover the faces of all the devices so no IR leaks are possible, but take Tom's Advice and dump the Silver POS 3100 and get a remote with IR routing. You will still need to cover the ir emitters with shields.

What models of products do you have?
Most of the Sony megachangers have a command set switch on the back of the unit, so that should take care of part of the problem.
Is the dual deck cd recorder a Pro product?