I'm not aware of being able to apply more than one MIDI note to a footswitch, someone correct me if I'm wrong. There are ways round that though. I have a patch that I use to play the root and whatever additional pitch I select with it, all at the same time. Plays a two note chord from one note. Great with the Ebow. That uses the 'dual pitch' effect. Very easy to set up. I have it set to play the root with 4th, 5th, 7th, 9th and 10th. I don't know if that's what you mean. Anyway here's a vid of it in practice.