Topic: stereo echo sounds mono...how to solve??

hello guys,

I need help with my RME UCX and Total Mix settings. I'm on Mac.
I don't know why the Echo fx on the mixer sounds mono. The Widh parameter is set on max value and the mono button on the master out is deactivated.
Any suggestion? drivers and firmware are updated to last version.

Thanks to all that can try to help me

Tommaso