@defragster
I was replying to this from @eegee:
"Hey Andy - it looks like from your pictures you added a 2nd USB connection for your keyboard - is that right? I’m hoping to just use the onboard usb connection for the midi keyboard and power it all via external power. I assume I shouldn’t cut the power usb trace?"
I wasnt' sure if he (she?) thinks that the existing micro-USB *connector* on Teensy can be used as host. This sounded scary: "I assume I shouldn’t cut the *power* usb trace".
I wanted to make sure the poor Teensy doens't get mutilated.
@eegee - you do need to add the second USB Type A connector for the host, connect it to the Teensy's power line, via the current limiter, and to D+ and D- lines on Teensy 4.0, or corresponding USB host pins on any other Teensy you use.
Just remember that the connected USB device can't suck in more than 250mA, that's Teensy's limit.