The opening chord is programmed to a Midifile, if the songs starts with a vocal prelude or intro or if the singer starts to sing at the same time with the song.
Or in other words: whenever the singer has no chance to hear any note from the song before he has to start singing the opening chord is set.
We play the base chord in chnanel 4 at the beginning of the count-in (bar 2) as a piano sound.
If the song begins with a voval intro, you will hear a hi-hat pedal sound on count 2 and 4, or adjusted according to the beat if it is not a 4/4 one.
Some examples:
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