I always voice, then animate to the voice.  This is standard practice at animation studios.  The other way around is much more difficult.  There was one person on BiM a couple years back who did it the opposite way, which is rare.  But since it worked for him, that's fine.

Actually, to be more accurate: I animate first, process and lay out the audio second, then sync the frames to the audio third!

This was one diadvantage that I had found before when recording my voices

Before before before before before before

that being said, I'm guilty of doing it after. Especially in dialogue heavy things I don't really care about. But if I care about a video I'm making, then I ALWAYS do it before. It makes the line delivery so much more natural and smoother.

Of course, lining these audio clips up can be hard if you don't have a fancy program to do that. So print out an X-sheet and line up your audio by hand. It'll take a bit of time because you'll have to figure out how many frames each piece of dialogue is and how long you want a particular movement to be. It's basically just planning out the entire shot instead of doing it as you go.

It's really quite helpful. I used to do this on paper before I got a program to import audio. Just take a bit of planning and it'll save you so much time at the end, and will also reduce your headaches when you realize the animation doesn't match well.

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"Whatever you do, do all to the glory of God." - 1 Corinthians 10:31b

I have been contemplating on getting audacity for a while now, so I'll probably get it if you recommend it. I know lots of other people use it, so it's probably worth a shot

In the beginning, I would sometimes do some voices after since I could easily edit the picture lengths to match the audio. However, when I became more and more professional and tried to increase my production quality as high as I could, I started recording voices beforehand (quite some time ago) and since I had upgraded software, it was much easier this way during production. I'd recommend doing the voices before going into production/the animation process as this is the way the majority of big studios tackle it.

I dont understand the voices thing you ask. Are you asking how to make your voice sound like other people's voices? I'm afraid that's nearly impossible. Unless you know how to change pitch and autotune extremely well, it can't be done (and even if you did, it still wouldn't sound right). It's all in the voice actor's voice.

But as for music, make it afterwards. That is, if it's a soundtrack. If you're making a music video, or a dance routine, have the music ready beforehand so you can animate it to the music. But if it's just a movie score, it's best to be made afterwards so everything lines up well.

That being said, when using royalty free music and downloaded music and whatnot, you can pick it out before if you feel like it and listen to it to help set the mood for the scene when animating. But it definitely isn't intended to be lined up beforehand. It can be if you want it to be, but that's only if you stick strictly to the sound edit when animating and don't intend to adjust anything in post at all.

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"Whatever you do, do all to the glory of God." - 1 Corinthians 10:31b

Well, there are filters and stuff to make you sound like you're somewhat robot-ish like Darth's voice. And with some breathing sounds, it might be convincing. But unfortunately, technology just isn't up to making people have emulated voices yet.

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"Whatever you do, do all to the glory of God." - 1 Corinthians 10:31b

I've always found that record voices before was the way to go, when I first started animating I learned fairly quickly why not to record after lol. I like to animate to the audio of the film and then adding the rest of the sound effects and then the music at the very end.