Video demo: external audio recorder

There is no easy way to  do this, sorry.

Usually this is my workflow, because I also like to have a final audio clip:

• ICreate a script for the audio.
• When recording the video demo I will rad the script, to have at least a timing approximately synchronized with my movements (visual part).
• I will edit the Video Demo in the editor: trimming, splitting, panning, zooming, adding static objects, clip transitions....
• When finished I have a good idea about the length of the final audio clip, will record it in Audition (or another app like Audacity).
• I replace the draft audio by the final clip
• Some adjustments may be needed.

Another tip: I always record  short video clips, and seqenced them. It makes it easier for the audio clips as well (although they need to be one long audio) and it is a necessity when I want to use the result for an interactive vdieo.