Logic Pro 7 & earlier Transmitting midi clock in Logic 6.4.3

Good morning. I use Logic Pro in OS 9, and I can't figure out how to send midi clock to more than two destinations in OMS. I look in the Song Settings section, and there are only two drop-down boxes for sending midi clock, even though the manual says something about an "All" option, which I can't seem to find. Am I being obtuse? Anyone know where I'm going wrong?

Thanks, Pete