Yes, in fact, all of those slots can be filled with your custom EQ's!
There is only nine slots, does that mean I can have only nine EQ's?
The slots are simply shortcuts, you can use multiple custom and preset EQ's within sonar, having your favorite ones on the bar is just a more convenient way of accessing them!
Can I make changes to an existing EQ?
Yes, you can! The three dot mark on the bar allows you to modify, delete and even duplicate your EQ's at will!
GLHF!