Please forgive me for asking a question that might have been answered in another thread.

I have a KO Propo 2.4 ghz system. I'm looking at buying the new E-Revo Brushless Edition. This truck comes with a Traxxas 2.4 ghz system. Both are Spread Spectrum. Is it possible to bind the KO Propo transmitter with the Traxxas receiver? Or will I have to purchase another KO Propo receiver if I want to use my current transmitter?

No, they use diff ways of coding and decoding their signals - both covered by different patents, these are different propietary technologies. You'll have to get another KO Propo receiver if you want to run the ERBE with your KO radio.