It's almost white noise yes - a low level hiss/drone. I thought it was an input thing, but it's the same with no amp input ie no amp connected.. I'll check again - it was set with no attenuation so I'll check the settings - output would have been about halfway with no space or voicing set (ie fully left). Input would be full and not pushed in for low.
In order to help you out, please submit a ticket on the Two notes helpdesk (support.two-notes.com) with audio samples recorded from the XLR outputs of the Captor X please? Can you also put the full description of your setup, please? this will help the technical team to understand your issue as quickly as possible.