Yes it was Jay Easton and his Subcontrabass BBBb Tubax at the World Saxophone Congress Wednesday July 9th!
After showing serious "go low" skill on his Orsi Contrabass EEb Sax and Selmer BBb Bass Sax, Jay took "how low can you go" to seriously new depths! The lowest fundimental of the Subcontrabass is roughly 24.6 hertz, low enough that you can nearly count the pulses!!!
What an instrument! The workmanship was stunning! The very serious crowd of exceptional players who mobbed Jay and his horns after his performance really was heartwarming!
I'll ask Jay if it ok to put up the photos.