AUF227 is the same as AUF200S. The transition from one channel to another is performed by an electronic mixing (fade in/out), which all parameters can be modified. This can be done either with the presence of the modulation on channel B, or when detecting a 27 Hz in the channel B modulation, or using a combination of both. Switching using an external loop is also possible.

On request, the detection of the 27Hz is available on A channel to switch B channel. For instance when the satellite must switch on the regional program.