PAS walker

I am not a teacher, or professional musician, I play a guitar for the joy it gives me. This app is great, when it works. It tunes precisely, but suddenly gets stuck on one note. There is nothing I can do to force the needle to move again. It is incredibly frustrating. I went to the App Store to see if there has been an upgrade, but it appears that nothing has been done to repair this in two years. Please please repair this App.