Hello everyone! I now better understand the line input versus the mic input on my czh-05B FM transmitter. Using a computer microphone I cannot obtain any signal. My line input transmits perfectly. I am thinking that perhaps when I attempted to input a line signal into the mic input socket, I may have overloaded the mic input circuit??? Any thoughts as to this possibility being my reality? I have ordered another FM transmitter (same model) so I will attempt to use the mic input for only a microphone when it arrives and see if it will transmit voice. Thanks for all the information…it has really expanded my understanding. Rob