car neon heartbeat

hi friends,i am new to this forum.i have a small question,please help. i have just completed the installation of neon lights in my car but i dont really like it to be static when it lights on.i was thinking to connect the neon to a sort of sound sensor to my audio amplifier to make it light in a more dynamic way but the problem is that whenever i will like to light it,i will have to listen to some music. i got the idea to make it light as heart beat way like in need for speed underground can someone tell me how can this be done please.maybe the use of a relay and capacitors can make it but how. thanks for your help.

http://www.alibaba.com/product/shinyautos-215972266-0/Sound_Sensitive_Controller_For_Led_and_Neon_Lights_With_Music_Mo.html