I realized that my message could be a bit confusing.
I have soundcard which has only TRS Output which I use for my studio monitors. I'm trying to find solution which makes that TRS deliver sound to my monitors and also in the same time to my headphones. If iNano would work so that I could just plug the TRS in and then connect my monitors and headphones to iNano and also hear sounds from all of those devices, it would be perfect.