Hi. My original reply did not post. I have never heard of slacklining before and this is a unique way to practice with lightsabers. Please share more videos on this thread as you progress.
In the future please do not talk specifics about your future customizations but refer to them as a product from the other guys. The concern is mostly about naming another soundboard as this is the US Forum and the business side offers their own sound options and other electronics.
Thanks and welcome to this community.