Would there be any way to gain access to VSig to become familiar with constructing presets for an H9000 without access to the unit?
Not at the moment – H9000 registration is required to download the app.
However, an H9K user has begun posting tutorial videos of VSig on Youtube that show the funcitonality and workflow pretty clearly, so those might help give you a better idea of how VSig works.
One such video:
Your feedback is much appreciated, though.