New facts:
Changed the trigger an it worked. The old trigger ran perfect when plugged directly into the edrumin module. It didn't work properly with the splitter cable. Scary but seems to be a problem with the trigger.

Hi Rob,
thanks for your reply. It's this cable: https://www.cordial-cables.com/en/products/cfy-vgg

I have a question about dual mono input with DDrum triggers and a splitter cable. I have tried both, a splitter cable with and without resistor. With the cable without resistor I have the problem that there is a lot of crosstalk or even both triggers are triggered. With the cable with resistor I hav...