Posted by Ailure

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Mono cause that is how the music is on the orginal NES.

You can separate the audio signals to stereo on a real NES but it requires bit of a hardware hacking. It's funny when emulators have a stereo option though, with no way of setting stereo separation (it's pointless).

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The 2A03 chip mixes all the channels to two outputs before output. The two pins on the chip are bridged before it connects to the single mono RCA jack. Like Ailure said, it's possible to make it stereo by adding a second RCA jack and un-bridging the pins, but the problem is how the chip mixes the audio. The square channels output on one pin and the triangle, noise, and sample channels output on the other. I may have gotten that kinda wrong, don't remember off hand. Either way, you end up with sound that doesn't sound the best when split up. One way around it is to use a potentiometer to adjust the mixture of those two channels so it doesn't sound so obviously bad. The only other way to get the NES's 5 sound channels to be seperated correctly is to remove the 2A03 chip and implement your own custom one.