(if you leave it blank it will just use an example file) To import a midi file, go to: https://hexed.it/ Open the midi file then select all and use cmd-c to copy it, it should ask which format, select plain data, which should look like 4D32C5B5AF4... then just copy and paste it into the project and it should (hopefuly) convert it to a nice and easy to understand format.
