I'm using guitar Pro 5 to tab an original out, and I have a double bar for a riff on the first track so it repeats the riff 3 times.

So on the second track, it plays the same riff with the same double bar, but on the third time through I want the second track to play the harmony to the first track...how exactly would I do this.

This is probably a complete noob question, but whatever lol