Hello, Mudokon Master
I know exactly where you are, and yes, you figured it out correctly. You have to blow up the "chant supressor orb" by using a hand granade (from the boom machine, two screens to the left).
Here is what you have to do: you have to make Abe hold the granade for about 4-5 seconds, before it blow up (you can count the beep-beep little noises that the granade does - I think it beeps 6 times before it blows up) then throw the bomb making it explode in the mid-air, destroying the red orb.
advice: practice throwing the bomb from diferent angles by pressing the different directional arrows (up, down, left, right)
After blowing the orb, possess and kill the crawling sligs, except the last one, who you will use to press the green button to clear the path.