Daniel's recordings are archived at the
Phonogrammarchiv Wien, which is part of the
Österreichische Akademie der Wissenschaften (Austrian Academy of Sciences). They have an
online catalog of all their materials. They make material available for academic and research purposes. (They require an explanation of what the material will be used for.)
Daniel's recordings stored there total 19 hours and 45 minutes. Unfortunately, the archive charges a fee of 0.20€ per minute, which makes it very expensive to get all of Daniel's recordings. However, Daniel kindly suggested a subset that works out to five and a half hours, which is a lot more affordable (65.00€) and includes the recordings he made in Baro. I'm about to order these.
Cheers,
Michi.