The app uses recent SwiftUI and SwiftData APIs that are not available on older OSes.

Added to the list.

thank you!

We would love to do a more native Mac app if this takes off. Glad you're interested in it.

Thank you for the feedback. The crashes should be fixed in the 1.0.2 update rolling out today. If you have any additional feedback as you use the app more, please email us.

>I would also like the ability to start from a bar of my choice and maybe even evaluate a one or two bar section at a time rather than having to play the whole piece

^ IMO this should be among your top priority.