Hit problem with REMOTE CONTROL SOCKETS 433hz tutorial

Thanks so much.
I had the transmitter and receiver the wrong way around.

Using your code I've now got a switch turning on and off! :)
Now I just need to figure out why only "channel 1" switches work and not 4.

Am I correct in thinking all I need to change is the CODE variable?

For channel 4 I get this output: 0b1110010111111111000011100
So I replace the current string in code with that but it still turns on channel 1.

Thanks again for your help.