Hi Daan-
I’ve used the EX1; here’s how I suggest:
plug mixer into the XLR inputs and set to ext/mic & manual (put it on auto if you can’t monitor camera).
send tone from your mixer and adjust the camera levels until the meters are at -20. There is a meter with numbers on the ex1 in the “Audio Status” screen (pg. 90 in the manual). Push the status button on top of the camera and cycle to the “audio status” screen to see it (should be the second screen).
Also, make sure the trim setting is at -41dB; this is the factory default setting for mic level and should already be set, but double check.
AND, monitor the camera with headphones. Just because the levels look right, doesn’t mean you’re not getting distorted audio.
Regards,
Dave