Actually, that video presents exactly the issue that I alluded to. It occurs in (I believe) all of the games that you played, but it's easily noticeable in Link to the Past--compare the audio to audio from the original game and you'll notice that it's playing in the wrong key (about a half step higher than it should be). This is a common error with SNES emulators that drives me nuts, so I'm hypersensitive to it. CatSFC Plus doesn't have those audio errors, but runs at about half speed. Admittedly, it might be fixed within the next few releases, and I was uninformed about just how powerful the N3DS is, so I will definitely continue to keep my eye on the emulation scene, but for now, Retroarch emulation is unfortunately unplayable for me. Still need to try out BlargSNES though.