

In addition to those steps, have you verified that this digital piano is compatible with GarageBand and macOS? If not, you may want to contact Casio for assistance.

It sounds as though you’ve walked through great troubleshooting steps. Apple Support Communities is a wonderful place for help! It sounds as though you’re wanting to use your Casio Digital Keyboard with GarageBand, but having issues where some keys aren’t being recognized as expected. I wouldn't like to expends hundreds of dollars to buy a new piano that is compatible with MacOS. I tried in other programs but it's the same issue. Like it just receive one note (if I play a few notes at once, like a chord, it just plays one of them in Garage Band). In Audio MIDI Setup there is an "USB2.0 MIDI" that looks to receive some of the MIDI information, but not all of it. It has Midi IN and MIDI OUT, I connect them to the piano and then to the Mac, but it doesn't work well. And now that I'm back home, my old Casio AP-33 can't connect to my MacBook Pro. I used to had a Digital Piano Casio PX160 when I lived overseas, and it worked perfectly in Garage Band (connected through MIDI-USB). I tried to install it but it didn't work, it doesn't even appear in Audio MIDI Setup. How can I connect a Casio Digital Piano (AP-33) to a Mac? After researching almost for a month, I noticed Casio don't do drivers for MacOS, however a guy back in 2009 made one that apparently worked. Well, I know this isn't a new question here, but I really can't find a solution for it.
