I read this thread yesterday.

This morning I went to a joint meet of the Bleasdale Beagles and the Armargh and Richill Beagles. Near Tebay in Cumbria.

I had a chat to both of the Huntsmen (both keen singers) and I told them about this thread. One suggested that it was a corruption of the word tuneful. The bark of a pack of Hounds is known as "music" To describe the cry of a pack of hounds as tuneful seems quite likely.

HOWEVER, I then looked at this list of traditional Hound names and, surprise surprise it contains the name Jubel.

List of Hound names.

Hounds are usually named in Alphabetical order (A for one season B for the next etc) Most Hound names contain 2 syllables.

It's a Hounds name. The pack sire? Probably. Maybe. I dunno.
Is this an adequate explanation?