They are the number of times the thread has been viewed... I.e. it's like a page counter...

As to the tuner question, Mk1's had a built in tuner, so nobody had to install a separate one... =)

According to the info from empeg it will be another box that is plugged into the docking cage cables.

Jazz
(List 112, S/N 00030, 4 gig blue. Unit for sale, apply within)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)