How would one (and how hard or easy would it be) write a patch which does the following: Instruct the user to play a sustained note on the violin; then give feedback about how accurate Helmholtz motion is achieved; Could we measure how short the transient takes from nonHelmholtz motion to helmholtz motion? How about changing from a note on one string to one on another, ... Could we write a patch that trains the user to minimize install and end times for helmholtz motion and to somehow show a level of periodicity during the systaining period?