Oh no I'm aware of Super Metroid's odd instrument samples, but this is indeed crackling audio, like the type you get when your earphones are starting to fail and you move them around to get the left one working again.also @ShadowOne333 maybe you just think of the natural audio cracking of the super metroid samples as a problem, to hear what I mean I just recorded the intro of it in both snes9x 1.53 on windows and snes9x in retroarch so you can hear that they pretty much give me the same output.
https://mega.nz/#!goAgkbLb!sxmKrVqmLEhochJmFtsr8I0XAS6qfHpG9YsEkiWcwn0
https://mega.nz/#!M0ZnUJiT!3_lls92sUq2Vsj8YPGnsn35Eo7qalwBP5ke0Q87cbWQ
That kind of crackling haha.
I will surely post a video to better depict my issues with both Snes cores once I get home.