Using Yamaha Steinberg Driver to el capitan

I bought a new Yamaha mx61, downloaded the Yamaha Sternberg Driver, and tried to connect using the audio midi setup to El Capitan 10.11.6. While it connected, it would only play 1 or 2 notes simultaneously and the response was sporadic. Ultimately, I’m trying to use Sonicscores Overture 4 or 5, or Garage Band. Either way, it’s not behaving properly, long before I try to connect it to the software. Any help would be appreciated.