Assuming you are running everything in mono, there isn’t really a “second output.” If only one cable is in the H9 output jacks it will mix the stereo effect output to mono.

You could do as you say, and connect a cable to the second output,  but this means you will only get half the stereo in your effects loops and the other half to your console.

But that may work for you. Otherwise, you probably should use suitable Y-leads or DI-boxes instead.

Hi Nick, and thank you for your quick response. 

Yes, that’s what I’m thiking of doing.

So you think it will sound good if I have, let’s say the left H9 output to the amplifier effects return, and the right H9 output to an instrument channel in my sound card, and apply some cabinet simulator like guitar rig?

Thanks!