HDMI Audio Question

[Slot Car Driver]

I am using a HDMI cable from my Dish ViP622 to my Toshiba 27" LCD.  I also have Toslink optical audio from the 622 to a Sony Processor.  The Sony Processor has Line Out for all of the audio channels.  The line out audio is feed to stereo amps and I would like to use the Toshiba TV for the center audio, but the HDMI cable passes the audio.  I have tried HDMI to DVI and then DVI to HDMI adapters to block the audio, but the audio still goes through.  Any other suggestions on how to block the audio on the HDMI cable?