There is only one known example of Bix getting to speak on record. Bix biographer J.P.Lion writes:
"Edgar Jackson, from the British magazine 'Melody Maker', travelled to New York with the Bandleader Jack Hylton in August 1929. He attended one Whiteman performance, at the end of which he recorded on portable equipment (using an aluminium record) the voices of the main musicians of the Band. Bix's voice was recorded. This unique disc was destroyed in 1941, together with Edgar Jackson's other record collections during the bombing of his house in London."
On these records the various members of the Band are supposed to have sent their greetings to the Orchestra's fans in England. These priceless discs, in the ten years they were in existance in London, must have been played occasionally and it's quite possible there is someone still around who has actually heard what was on these discs.
As for the German bomber pilot who destroyed Edgar's house, well he must linger in Hell for all of eternity.