I just got my Fulla 3 and I'm absolutely loving it. According to the documentation there is way to bring another audio source into the DAC and use it as an amp. Is it possible to use that feature along with the actual DAC functionality? Obviously I tried having an audio source connected but the DAC function didn't seem to work with something plugged into the 3.5mm jack in the rear of the unit. Once I removed that 3.5mm plug, the DAC functions as normal. I guess I'm asking if there is a way to mux the two audios together? Is that a feature of this DAC/Amp or would I need to do something else?

Use case:
Listening to music from your phone through the DAC/Amp while working on your computer doing something else (you may need sound). Example being like listening to a conference or sounds from a piece of software.
OR
Working with multiple computers and need to hear all their sounds