Question about Schönenberger Wireless switch set

According to the manual, each receiver should be able to learn up to 6 codes. The remote control transmitter has 4 pairs of buttons, so it should be possible to control each socket individually with the first three pairs, and the code of the fourth pair of buttons can also be learned and used as a master button for all sockets. I haven't tried this out because I have programmed all the sockets to only one button, because I always want to switch all the sockets at the same time, which works fine.