Intensity Shuttle + Desktop Video // Sound Bug

Hi everybody!

Please help me to solve the bug.

I sream video. My system is:
Roland V-1HD (HDMI video switcher) ->
Intensity Shuttle USB 3.0 + Desktop video 10.7.1. HDMI in for Video input and Analog for Audio input.
The sound to Intensity comes from audiomixer Behringer Xenix 1002.

Everything was fine, but some time ago I've got the problem with the voice coming out from Intensity. Its tone is not stable and sounds like wave. I did voice sample but it's not allowed to public URLs...

I absolutely don't know what it could be...

Please help me with Your advice!!

Go back to an earlier driver version. (Try 10.6.5 or earlier) The newer drivers are not that good when it comes to audio