I had to create an account just for this
When coming home about a week after I'd had the recall done on my 07 350GT, I heard something very similar to what i hear in this sound clip, so by the time I'd gone into my drive way (luckily about 100 yards away) it was sounding like it was breaking teeth off gears... (In or out on the clutch, moving or not moving, neutral or in gear same noise).
I called the dealership, they wanted me to drive it in. I told them there was no way it was getting driven in, so a towing company came out and picked it up...
Well it was just returned to me yesterday with a replaced flywheel, when probed for specifics it was, "something was rubbing on the flywheel"... Looks like the parts replaced were the flywheel and a bushing...
I was discouraged because it was roughly one week since I had the recall done for the slave cylinder. And I thought it was faulty recall work done, since the dealership I am dealing with hasn't been very competent in the quality of work they've done so far.
Whatever your issue ends up being, I sincerely hope your problem is solved sooner than later!