Sound issue with VCI 300 and Traktor Pro

Hi,

i achieve to map the VCI 300 to Traktor pro thanks to this forum.
The mapping seems to work pretty fine. But i have a big issue with the outcoming sound (both in headphones and the master output).
The sound comes out with a lot of distorsion, i'm not experiencing the same issue with itch (so not an hardware issue).
Does anyone has any clue ?

Thanks