Troubles with live flash using

[Volodymyr]

All kinds of PCM - the same.  On musicla signal - very small amplitude, like background (and my speakers are 95 db/m/w sendetive). Thet are more loud and frequent when play sine wave.  If I change pc  usb 2.0 to laptop usb 3.0 - clicks are here, but 10times more rare.   Can I attach video record somehow?

You can upload to youtube/vmeo/facebook/etc, and include it here. (Click the video icon in the editor, to the left of the smiling face).

Windows PC - I do not have at home, should borrow some laptop.

Not sure if I can help in any other way.. One other thing to try, perhaps use a different USB port? See if that works. Try different USB cables as well. 

ports and cables tried already, all the same.  When upload video, will post.  When solve this issue, than will come back for Snakeoil testing again.