That is unique...I understand Stan's as it's bari tuning one step higher but can't figure out where your's
Daniel, he's saying
b flat e flat' g' c' . That's a "low reentrant" or Cuatro e flat tuning.
The "high reentrant" or Ukulele version -
b flat' e flat' g' c'' - was one the the three early Soprano tunings, along with D, and C. A step up from "Ukulele Standard" D tuning, like all of the flat keys, it was popular with jazz players. You'll still find old jazz sheet music written for E flat Ukulele.
You can still use it on the Soprano in it's high reentrant form. In it's linear form -
b flat e flat' g' c'' - we recommend it for Concert Ukuleles, and when you then drop the 1st string an octave as well, like Thom's set-up, it becomes a very nice fit for Tenor Ukuleles.
At least I thought it would. As we don't have standard Tenors, we had tested it on one of our longneck concerts. At the time, I had thought it really had the depth to be great on a standard Tenor. Thanks to Thom for the feedback!
On the subject of beautiful and neglected voices for the Tenor, another couple are Linear D -
a d' f#' b' - and high reentrant b flat -
f' b flat d' g' . I like Stan's too, in the high reentrant form.