They were recorded live in the museum. Debence has a website: HTTP://www.debencemusicworld.com, and has CDs available for sale.
Two selections are available. These may stream, with luck.
The Military band organ has a brassy character, and is "mostly" in tune.
Military Band Organ - Unknown selection
The 105 was in terrible need of a full tuning, with a number of pipes a 1/4 to 1/2 pitch out of tune.