I'm doing something similar with my project. What I do is have something like audacity playing the voice clip in the background while cartoon animator 4 is setup to record.  You might have to use headphones for this.  I just set cartoon animator 4 for 1500 frames in the project window and then when the appropriate point comes up on the music, hit record. Later I'll go back in trim the animstion and drop in the audio to my animation, adjust the timing and then save that project with the audio embedded.