I have a funny story which goes with this puzzle. In one of the localized build for the russian market I forgot to turn off debugging variable, which in turn automatically solved the puzzle. Next thing I know was this angry bug report:
PLEASE INSERT BACK DECIPHERING NIELS LANGUAGE PUZZLE. It was good puzzle, interesting and with great sounds. If you consider it too difficult (Hmpf), then just insert possibility skip it or auto-solve after some time. Russian questers like difficult (but logical) puzzles. And it was right one.
I of course never meant to put this puzzle away (and for genuinely hearing-impaired people I even solved the puzzle personally), because as I stated it's more "logic puzzle" than audio based puzzle (in comparisons to non-musician's nightmares like organ puzzle in Voyage

) But this angry response from russian testers cheered me up as I realized that the puzzle really works.
