Using universal remote control with Line Magnetic amp

I can't say about your specific amp. However, if it was capable of using a remote originally then go to the Logitech Harmony web site and check their database for components it will control.

I have one of their remotes for my AR LS-16 pre-amp and it works but only on a limited number of functions. It will not change input sources.

Thank you, n80.
Will check with Logitech. Problem is I managed to misplace the LM-remote, can't find it at all, so have to look at alternatives

Seems like I require a USC code. I don't know if this code is totally unique to each device, but if not, will someone be willing to share theirs? Please...
I have the LM 518ia

Some remotes have a learning function, point at each other and it will pick up what is needed 

Thank you, truemaineiac. Problem is the Line Magnetic remote is missing.
Line Magnetic devices are not listed on the Logitech database. But, apparently there is a USC code if you remove the cover on the remote.