WashTub Bass

​My original idea, standup bass, was changed to a washtub bass. Which is a bucket with a hole in the middle and a knotted string, tied to a broom handle that is to be rested on the edge of the bucket and used as a fulcrum (I think thats what it is?). The sound is produced by plucking the string, which is tight, then the vibration from the string produce waves which are transferred into the bucket. You can change the pitch by moving the broom handle, the closer to the hole the more bass and the farther from the hole the higher pitch. I am already done building, I used a bucket, string, and a broom handle. How can we determine which angles play certain notes?