Thanks to all who replied to mimmo’s OP. I couldn’t find it anywhere in the guide where it explained that STR1 came form stereo output 25&26 (Qu-24) and so on for STR2 and STR3 when USB Streaming. This is my first mixer and it can be a tad confusing.
thank you so much everybody for your replies.
I have also installed both DAW control and TCP midi driver.
Even if I actually haven’t find a solution I do a test with quicktime player and with a UVI grand piano.
Both of quicktime player and UVI grand piano works well and I can ear them coming from ST3.
But no sound coming from itunes and safari (youtube ecc. ecc.).
Thank you for your helping.
MImmo
We are aware of this routing issue on some versions of Mavericks and Yosemite. Looks like an OS X bug since it affects other products with different USB platforms.
There is a possible workaround which we found to work in most cases: in the Audio Midi configuration window, go to Multichannel Mode, and ensure that it is set to a valid Multichannel mode, for example 5.1, NOT stereo. Stereo audio should then return to the correct channels.