Ooh, that sounds interesting. Then let's examine the instance of the horn being blown in order to try and draw some firmer conclusions about how it operates. Let's assume nothing.
Perhaps if the heroes have some knowledge, Lews Therin will be able to give Rand some insight as to how it...
The link between the horn and its sounder was said straight out in book 3. When Mat recovered from the dagger he was told so by siuan. It was also stated several other times that I remember less specifically. To everyone else it is only a horn so long as the first sounder is alive (provided...