Multiple Frequencies Data Communication

How is working yes, how to do it will be not easy to find, old RC controller.
How many channels you need ?
It is music or voice ?

https://www.google.ca/search?rlz=1C1NCHB_en&biw=1440&bih=744&tbm=isch&sa=1&ei=QbMDW-H8K6nbjwSy5onADg&q=rc+controller+circuit&oq=rc+controller+circuit&gs_l=img.3..0j0i8i30k1j0i24k1.9291.14373.0.19742.8.8.0.0.0.0.390.953.6j1j0j1.8.0....0...1c.1.64.img..0.8.949...0i30k1.0.vWD4qfv6V64#imgrc=dhLwmQTM5CxnaM: