humperdood

I have a 2004 Honda Accord EX V6 with navigation and the TV tuner from AVElectronic. The sound is horrible with the FM modulator because the soldered FM modulator unit broke off because it was cheap. I might try to fix it, but evetually I want to replace this. Since the extra "aux" port is being used by the XM radio (unlike the TSX), is there a solution I can have besides taking out the XM radio and using the SHON adapter unit? I want clear sound wired directly to the back of the headunit. Thanks for your help.