answer:I’m not a guitar player so I can’t answer this directly. But is it possible the recording you heard in playback was actually performed in either Dm or Em ? Changing to those keys (or their relative majors, F and G, respectively) would be WAYYY easier for most players (my experience is with winds) & so small a change won’t affect a vocalist’s performance. Can the software itself be “tuned” to offset what it “hears”? A semi-tone amounts to only about a 6% change in playback speed, & the actual pitch difference here is probably less than that. From what little I know of music theory, the choice of underlying scale depends on the nature of the music.