Based on recommendations from people that have successfully got things to work, I ended up getting the MIDIPLUS USB host. Now things work fine. BUT things break when I start using the sequencers!! Once I activate the sequencers (endless, finger, etc…) after a short while, I hear a stuck note and then no midi! I have to reset the box. Not sure what is going on, but it feels like the OP-1 is somehow “flooding” the USB Host with midi data when the sequencers are active. Not sure if there is anything I can do on my side to resolve this. I do have USB charging turned off as well.