Due to technical difficulties on my end, I’m not able to listen to that file. But one idea, there’s a service bulletin for your car equipped with an automatic, about a transmission noise related to the transmission shift cable. 3712-03 dated 2.24.12. It’s described as a whistle or whine sound, noticed in the 55 to 65 mph range. You might be able to see it by googling that number.
I don’t see any bulletins related to the torque converter, at least not on the 2011 Jetta 2 L 4-banger. If you think it is a TC problem, you might want to schedule a proper transmission service, see if that has any effect.
Another idea, engines can make weird exhaust noises during deceleration. Often it is sort of a minor backfiring/puttering sound. On some older engines the cars actually had a deceleration valve in the vacuum control system to address this. On newer cars I expect it is done with a combination of the maf, vss, map, and tps sensors, and the ecm uses those inputs to figure out when to do whatever it does during deceleration to prevent the weird exhaust sound from occurring.
Another idea, the ecm is supposed to completely shut off the injectors during deceleration until a certain speed is reached, so maybe that isn’t happening. I can clearly feel it happening on my Corolla by starting at about 35 mph and steady in 3rd gear (my car is manual), then removing my foot off the accel pedal completely. The car gradually shows down to about 10 mph, when I notice it accelerate a little, which is when the injectors start firing again. You could try that, see if your car does the same thing.
Finally, do you have any engine diagnostic codes stored in computer memory? Is the check engine light on?