A while back I discovered that my digital piano has a record feature. So I began to use it, because it turns out that hearing what you’ve played AFTER you’ve played it can be really useful. I find myself noticing things I wouldn’t have while I was playing, like if I’m too heavy on the keys or not holding a not long enough. Stuff like this. How much I’ve actually improved thanks to this I’m not so sure, but it’s still a neat feature to discover years after buying the piano.