Hi, I use the vocalist pro also. I do not use midi because my presonus 24.4.2 does not have midi input 0r output although I guess I could use their daw sequencing software but it is a hassle. So what I do is just record a basic guitar strum pattern within BIAB and put it into the presonus, then take that track and out put it to the input on the digitech vocalist pro and it works like a charm. Just like plugging a guitar into the unit and strumming along. It tracks the harmonies quite well. It works for me. I have used midi with other recording devices and BIAB does a fine job with this as others have explained.

Nelson