I’ve got a Piano Hat that I bought some time ago. I was using it on a Pi 3 and I decided to move it to my Pi 4, but it only partly works on the Pi 4. I’ve tried the buttons and simple piano demos and none of the buttons below number 9 register on the computer. The lights flash when I touch the buttons but the scripts don’t get events. Buttons from 9 upwards work, they register and play notes on the simple piano.
I moved the Piano Hat back to the Pi 3 to see if I’d damaged it and it works fine there, all the buttons work. Then when I moved it back to the Pi 4 the buttons under number 9 didn’t work,
Is there some compatibility problem with this hat on the Pi 4?