BioSemi.nl

Hi, we want to set-up the BioSemi ABR module and use the audio click track sent (trough a StimTrak and) into the Erg1 channel as trigger. We are using shielded and grounded headphones and have never observed stimulus artefacts for this set-up with the normal BioSemi cap electrodes. Using the ABR electrodes, we now however pretty much only see a large peak centered at 0. Has anyone ever experienced this issue / how could this be avoided?
Thanks for your support!