Thomas Fürstberger, tf11972, the producer of this sample set, found distortion in the recording I uploaded two days ago. It was made with the organ loaded in 16 bit surround and at 96 kHz. I used Audacity to convert the resulting .wav file to 48 kHz .mp3.
I reloaded the organ in 24 bit and used the midi file to create a new .wav file. Conversion was once again via Audacity. tf11972 tells me that this version is without distortion.
I think it's important to present the sample set at its best.