I am basically having the same issue, I’m using v drums as a midi controller and the open hi hat sustains, there is no choke when closing the hi hat. Many apps have choke groups, I don’t find any resolution for this in music studio. I think the expectation from the developer is to utilize the release slider and shorten the release of the open hi hat? It’s unauthentic and also terrible if you’re using midi for drums. I’m struggling to find an app that can do all things, it’s frustrating . I love the music studio app but this lack of choke on the open hi hat is super disappointing