I got to the mission where you first fight the Heavy Ceph on a road leading to a hive and I got fed up with the nano catalyst bugs (not getting the stated amount, losing all of it on game restart) so I decided to start a new game on the hardest difficulty while Crytek fixes the game. Upon restarting, I noticed that I don't hear my own footsteps anymore nor do I hear either the jump, landing, the grunt on super jumping, or the power sound from doing a super jump. Not a game-breaking bug but kinda breaks the feeling of power when leaping over things. I'm going to try reinstalling to fix it.

While waiting for the game to reinstall (it takes a long time), I had a thought: I do have the suit upgrade under the stealth tree that dampens footstep sounds. I don't think it mentions jump sounds and I'm not sure if it applies when you aren't in cloak mode but I'll check this when I finally finish reinstalling.

Ok, I can confirm that this is a feature of the Covert Ops upgrade. Interestingly, its description is "Suppresses the sound of footsteps" and makes no mention of removing the grunt and landing sounds of jumping nor the power sound from super jumps.