Just got back from a great trip on Tuesday! I wasn't able to hear the little girl on the radio when I was there on the 28th.
There was a lull in the line as the 7 PM Fantasmic was going on and I was the only one taking the "straight" path in the queue, I listened for a minute by the workbench and wasn't able to hear anything. I asked a bellhop about it who was confused as what I was doing since there was absolutely no line at the time and no one waiting for the open elevator. The bellhop looks at me like I had three heads and didn't know what I was talking about. He didn't think there was a radio on the workbench. Also, I tried to pull the lever on a electric junction box on the right side just when leaving the library because I heard it did something but nothing happened. Anyways, great trip and I'll post more thoughts later!