LLE audio is not an "out of the box" setting though. HLE audio (the default setting in Dolphin's settings from the downloads page) should work just fine.
At least on HLE audio, the audio should only mess up if and when the speed drops below 100%, and even then Dolphin will simply play the audio slowly in accordance with the speed (e.g. 50% game speed gives you 50% audio speed). It shouldn't snap, crackle, or sound choppy. That may not be true of LLE audio (I have not used LLE audio for a long time, it is not an option that needs to be used often these days) but HLE audio should sound slow at the very worst.
If you have not edited the SMS .ini, the only things that can affect the audio quality are the settings you manually set yourself (via the Graphics or Audio options for example). See if you are running this game at 100% (go into Windowed Mode and look at the status bar at the bottom). NTSC versions of the game should run at 30 FPS and the VPS should be 60. PAL versions of the game should run at 25 FPS and have a VPS of 50. Note any anomalies during gameplay.
At least on HLE audio, the audio should only mess up if and when the speed drops below 100%, and even then Dolphin will simply play the audio slowly in accordance with the speed (e.g. 50% game speed gives you 50% audio speed). It shouldn't snap, crackle, or sound choppy. That may not be true of LLE audio (I have not used LLE audio for a long time, it is not an option that needs to be used often these days) but HLE audio should sound slow at the very worst.
If you have not edited the SMS .ini, the only things that can affect the audio quality are the settings you manually set yourself (via the Graphics or Audio options for example). See if you are running this game at 100% (go into Windowed Mode and look at the status bar at the bottom). NTSC versions of the game should run at 30 FPS and the VPS should be 60. PAL versions of the game should run at 25 FPS and have a VPS of 50. Note any anomalies during gameplay.