I was using my TivoHD last night and turned on my receiver to listen to the audio and turned down the volume on my TV. I did not hear any trademark Tivo "bee-doop" sounds while using the remote while watching a recored or live show. I would only hear the sounds while in the Tivo Menus. However, if I put the volume up on my TV, I heard all the sounds everywhere I'm supposed to. My receiver is connected to the Tivo via Digital Optical cable. My TV is connected to the Tivo via HDMI. Any ideas what is wrong?