...forthcoming from the Helbling label:
https://www.jpc.de/jpcng/classic/detail/-/art/hans-koessler-chorwerke-choral-works-cd/hnum/4411471 (https://www.jpc.de/jpcng/classic/detail/-/art/hans-koessler-chorwerke-choral-works-cd/hnum/4411471)
The samples provided sound right up my alley... hope RI makes it available on their site.