Another thing worth checking.. have you checked the system with another cart that has sound? I am thinking the fault MAY be the actual Audio hookup to the TV (or the TV ). I have had SCART plugs partially come out which has left the picture working perfectly but one audio channel vanishing. Depending on what you are using cable wise might be worth checking too. Perhaps check the AV connector on the back of the Jag, make sure it is nice and happy and that the cable is well seated there too. Or if you have an RF enabled (never thought I'd refer to RF as "enabled" ) perhaps try tuning that in and see if the audio is present there?
I have tried a few other games on the same console, they all seem to be working fine, all have good audio. It's just Atari Karts that seems to be having an issue on my main console.
I just tried the same copy of Atari Karts on another console, and the audio is working great. There is something wrong with my main console, and nothing wrong with my copy of Atari Karts thank goodness. This is the first time I have ever had a Jag console start to go out on me. I will take it to a friend that can do some basic testing on the board, but it sounds like I will just have to use another console to enjoy the full glory that Atari Karts has to offer.
Thanks again for all the help, and if anyone has any tips for testing my Jags motherboard for a highly specific audio issue that doesn't seem to effect other games, please share.
Man I love this console