I controlled 2 lights with one controller. I didn't control them independently, so they both got the same IR commands. You need to make sure that both light's IR receivers pointed accurately at the IR emitter.
Mine have never forgot learned codes. I'd contact Current for support on that. They should repair/replace it.
Both of my controllers (the first one I made, and my iAqua one) do ramping with these lights. They aren't 100% responsive to every single RGBW up and down command, so I use M1-M4 in-between the ramps to keep the lights from drifting. If you want to do ramping this way, I can explain in more detail.
Also, the on/off remote code never failed for me in the several months I ran two lights. They never got out of sync that way. That's how I controlled power.
I think the power may resolve itself when I have the receivers in a fixed position. Right now I have them wire tied together. But the power on/off is really annoying, as there is no fix for it really other than either (a) try to isolate the receiver, which is surprisingly hard by hand, or (b) unplug the ones you don't want to control first. Both annoying.
But yes, the M1-4 are what i use to keep the repeated send in sync as well. I've got a "program" sequence I send to it which sets a specific value and saves it. Works well on one. Haven't yet tried it on four.
I am not trying to control them independently. Though... now that you mention it... if I can't get this overly reliable I may just do that. Build a little opaque container for each one and its corresponding transmitted (heck, I could just tape them together). Then at least the program could deal with each separately if needed. But that wasn't the intent.
yes, it's specifically that it "forgets" the M4 code. And this from the remote control. It will work for a while, then one evening when I go to turn off (I use M4 = all dim fully) one won't turn off. Isolate it and test, and it's been reprogrammed to something white -- not sure exactly what, it doesn't look full on. So I switch to white, down-repeatedly on white to fully off, press it four seconds....
Half the time at this point after about 2-3 seconds it comes on again, as though it's not continuously sending (at this point I'm holding both remote and receiver in one hand). And I start over.
Half the time it works, and then for a while M4 will turn it off.
Until the next time.
I need to start paying attention and see if it is always the same one. Frankly with four I loose track. But yes, you are right -- maybe it is just defective.
I've got the new Pi to build the controller but as I haven't figured out the details on the stand and plumbing cover, I don't know where anything will be positioned, so I have not wanted to wire it up. In fact one thing I want to test is whether it can control it from about 20' away, where I have wired network, so I don't have to use wireless (which with the one I got for the Pi runs really hot). So still experimenting. Sorry, rambling...
Anyone else try doing multiple and have issues, or is it just me?
PS. I sure wish manufacturers would get away from toggles -- an "on" and "off" is so much more reliable!