I misunderstood, running another program as part of a construct app is probably not feasible.
As rojohound said, you can try looking into JavaScript to record in stereo.
Personally I would just look into creating the audio file and accompanying data file with Audacity by itself, and importing those for use in construct rather than using construct for both asset creation and playback. Unless the goal is for the end user to be able to record and create their own content, then that obviously wouldn't be ideal.