I'm just starting with iReal Pro but since I already have some experience in programming similar systems, what I do to work around this limitation in a live performance situation to turn off count-in sound, limit the count-in to miimum (1 measure) and start the song with a 4 measure intro that don't necessarily require me to play at the beginning of the song, that will sound more professional than having the count-in sound or rushing a melody that maybe start in the measure before. Another good idea that works great with bossa novas and other latin rhythms is to start the song with 4 or 8 measures of rhythm only without chords (N.C.). I hope you find this useful.