I can't comment on helium frog sadly, but in stop motion pro you import a WAV file into the capture program.  You 'see' the sound as a wave with peaks and dips where there is no dialogue.  As you take a frame, the "marker" moves along the wave so you can time your movements to the dialogue.  You can "talk" when there is talking and you can do action when there is no talking (or whatever you want).

Works equally well with sound effects but sound effects are usually more forgiving in timing (ie you can usually edit sound effects to be anywhere in the timeline).

I was shooting a scene last night where the actor gets halfway through his line and is then interupted by something off frame.  I needed to know exactly when that distraction happens so I can animate to the frame.  Importing the wav file let my sync the dialogue and distraction to the minifigs actions precisely.

If you don't record dialogue first then you are simply guessing the timing on your animation.

Personally, I record first (in Audacity or SoundForge) and then I just do the math. I just select what part I need to animate at the time, take the length in seconds, and multiply it by 15. (i.e. 2 seconds * 15 frame = 30 frames). It works best to do it before so that you can make the dialogue fit the animation (like togfox said). Another example is in a film I am working on, I needed a character to make "quote hands", and I needed it to match the audio, so I calculated it, and he makes "quote hands" when he says the phrase he is quoting.

YouTube • Website

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

Thanks for the replies.   I ended up going the math route and learned the hard way that I needed to be less lazy and do more calculations in order to make everything line up, luckily my editing skills saved my back-side from having to re-shoot the scene.