My 2005 srt (3 weeks new to me) Infinity Modulus radio "aud" and "opt" buttons don't seem to work. Nothing happens when they are pressed or even held down for a few seconds. I found this out when I thought the radio should sound better ( lacking bass and fidelity sounds crappy) that's how I found out I couldn't change the audio settings, bass or treble the cds sound better. Any hints?