Hi John,
Thanks as always for the info.
My engine is engine #94.
I flipped over the tender, and saw the speaker, but there is no sort of volume or other control on the bottom of the tender.
I have attached a picture of the Specifications Label on the front of the box, as well as the underside of the tender.
If the diagnosis is a bad whistle sound board, then I am definitely sending this one back.
Thanks,
Mannyrock