The Link might need a Translation, there is plenty to read and Post 34 will be off interest.
https://www.analog-forum.de/wbboard/index.php?thread/132081-koetsu-systeme-erste-erfahrungen/&pa...
https://www.analog-forum.de/wbboard/index.php?thread/132081-koetsu-systeme-erste-erfahrungen/&pa...