I picked up the Evolution Guitars bundle, and although I am a keyboard player I want to use the Evolution instruments as closely as a real guitar player might, in terms of forming chords. So, I have poly strings disabled and I can figure out the right notes to play on the keyboard for chords that can be made in the first five frets or so, but I haven't figured out the right way to do this:

The G chord, circled in red, I can play on the Evolution guitars just fine. But how do I play the E minor chord as shown, with B on the 8th fret and A on the 7th? Like, what notes would I have to play on a MIDI keyboard, and how would I indicate the frets to use?
I've found the Fret Position control, but I don't understand how that translates to a chord made from different frets.
Also, if the Fret Position control is somehow the answer, how would I play the passage above, where the first few chords happen in the upper few frets and the following chords are played further down the neck? Do I have to automate the Fret Position?