SMS Out Run no sound issue

[segagamer]

I was playing the SMS version of Out Run tonight and while the game boots up fine on my Genesis model 1 with Power Base Converter, there is no BGM at all. When I started playing the game, I could only hear the sound of the wave on the music select screen. Then, when I am actually racing, I would hear white noise in place of the selected BGM for about 15-20 seconds, and then the sound completely stops. No audible sound effects either. I don't understand how that is possible, since there is nothing wrong with the game since I last played it years ago or the system, and other games play perfectly with full sound. I even used a commercial cartridge cleaner and cleaned the contacts, but to no avail. Any ideas on how to fix this problem?