If you have a long discontinued Airport Express, you might be able to use it as an AirPlay receiver for your Touch. The Airport Express has a 3.5mm optical output port that could be used to connect to the OPTICAL IN on the Ultra. Or one could use the analog output on the Airport Express to connect to the LINE IN on the Ultra.
As the Touch and Airport Express are unsupported by Apple, there's no guarantee that they will talk to each together.