I have tried all of the applicable options previously listed and still have not found a solution. Antares AutoTune EFX3 scans correctly when I pull up S1 4, however, when I add it to my Bus Channel, I'm unable to select any of the AutoTune options to apply to the chain. And when I apply the Bus Channel with Auto Tune on it (even though it doesn't work), and try to play the vocal with the bus channel that contains Auto Tune, S1 4 crashes. I've tried the steps mentioned about the settings and copied the contents to the desk, but afterwards, I get the same results. Its been going on for months! What's the cause and how can I fix it?