Hey, by default, the amidiauto takes care of the most common use case - connecting your hardware MIDI controllers to the MIDI audio software running on the system, and back - this is very useful when you’re using RPi and Pisound as an audio generator.
In your case, there’s no way for amidiauto to know what are your intentions, so you must update the /etc/amidiauto.conf file to tell it what connections it should make.
Please connect all of the stuff to your system, and post the output of the following command here, so w can help you come up with the correct amidiauto.conf file:
amidi -l
aconnect -l
and tell us which devices should be connected together.