You're right playing groovy at a slow tempo is hard but so great when it happens
For the Cd they was actually two CD's Live at the Moonwalker in Switzerland.
The Meters feature that night David Torkanovsky on Keyboards 'cause Art Neville couldn't make it !
I found one here
And several sellers here
A review said
"
This is the first half of a fascinating concert by the Meters, accompanied by the legendary JB Horns, recorded in Aarburg, Switzerland in 1991. Art Neville didn't make the trip, and is replaced for this show by David Torkanowsky on piano, but the presence of Maceo Parker, Fred Wesley and Pee Wee Ellis as the JB Horns is what makes this a special treat. Every track literally drips funk, which shouldn't be surprising, since the Meters and the Horns (both with and without James Brown) are among the original architects of the form. This is an unlicensed recording, unfortunately, that hasn't been approved by the musicians involved."