Yes Albert, I remember! It was either Film Forum or the NYPL Donnell Media Center shows I think. The only known Bix sound film ids that clip from the 1928 Fox Movietone we tracked down. He allegedly made a 1924 DeForest Phonofilm but no proof of that.
I strongly urge any of you on this page to get THE JAZZ SINGER 3 DVD set if you haven't already. 24 1926-30 restored Vitaphone shorts, include nice band shorts by Paul Tremaine (1929), Larry Rich (1928) and others. Over 8 hours of stuff in the set and under $30 on amazon. Vince Giordano and I do the audio commentary for the restored feature and are in the feature length documentary on the coming of sound/.