How can I create a guest network on an airport extreme that connects wirelessly with a Timecapsule

Question

I have a Timecapsule in one place of our house, that is connected to Internet.  I need to extend the range of my network:  1.  my private network needs to get to a remote location to make connection with speakers (Itunes).  for this I need to first extend the range of my private network, because the speakers are too far away from the TC.  2.  I need to set up a guest network, but at quite some distance from my TC, in an other part of the house, too far away from the TC (so a guest network on the TC won't do). 
For this, upon advice from an apple store, I bought an airport extreme, which I have placed on a location where it can connect to the TC, to extend the private network.  On the location of the speakers, I have an aiport express (connecting to the extreme), to play music from Itunes.  The setup at this moment is:  TC makes connection to internet, and broadcasts a private network.  Extreme connects to this private network, and broadcasts it further to the Airport express, that captures it and plays the music.  I would now like to create a guest network on the Airport Extreme, while this Extreme keeps on connecting to the private network of the TC and keeps on broadcasting it to the Express.  Is this possible?  How can I do this?  Thanks for the help !

Answer 1

I would now like to create a guest network on the Airport Extreme, while this Extreme keeps on connecting to the private network of the TC and keeps on broadcasting it to the Express.  Is this possible?
Unfortunately, the "main" router...your TC in this case....is the only device that can create a Guest Network, assuming that the TC is connected to a simple modem.
Unfortunately again, the Guest Network cannot be extended.  Your only real option here is to create a Guest Network on the TC and hope that it will have sufficient coverage for your needs.