This is a very interesting music app with a novel concept where the non-chording notes are (re)moved to give you a 1st, 3rd, 5th key sequence side by side. Your fingers can fall on naturally to form a C, hop to a G, etc. without the need to span unused keys. Okay, what’s missing? Courtesy for one. I’m here because a pop up forced me here “at my convenience.” That wasn’t nice. I was just starting to get a feel of playing and boop, I kicked out. I’m pretty sure I paid for some of the instruments I no longer have, so that wasn’t nice either. But the upgrade price includes new stuff, so I’m not too torqued. It’s not like I ever learned to use the Jamaican xylophone, or the main instrument for that matter.Why not? Well, it requires me to go into settings to turn off the page swipe, which is on Apple for making that hard to do. With it enabled, the instrument cannot be played with 4 fingers without bumping into the page swipe. Bad behavior, and I don’t want to turn off the swipe. So, the miss is that the app does not provide a means of turning off the swipe temporarily. That could be as simple as a button that takes me to that setting to turn it off then back on when I’m done. That is missing and puts me off the instrument. Otherwise, highly recommended for those who don’t swipe. H