Hello again, Alabalcho. It has been a while since our last communication. My fault. But I have continued to try to find some resolution to my problem as presented in earlier exchanges. I sent an email to Boss Audio asking about the MUSB35. They wrote back and asserted that the MUSB35 is an extension only; that it would not work.
I am old school in that I do not have a mobile phone. By choice. Too vulnerable to scams, pirating, identity theft, pfishing, etc.
Anyway, here is where I am at present. I have exhausted all your suggestions, even finding an audio player. But it is too limiting in that it has just two output ports.
My 5.1 system was hardwired when my house was built. I have speakers in my living room and a second set in my computer room/study. On the front of my old Onkyo there is a switch that allows me to play my music either in the living room (speakers A) or in the study (speakers B). And I have another switching device that will permit me to switch to the patio after I have selected speakers B on the Onkyo.
I have been all over the internet trying to find a system like the Onkyo I have with the one added feature: a USB2 port on the front so that I can simply plug in one of my several flash drives that I have catalogued by genre and just let it run without having to go back and change CDs, etc. Because my house is wired for 5.1 buying a 7.2 receiver would be a waste of money. I have also learned that some receivers that might work require that the second set of speakers by powered; the ones in my study are not powered other than by the Onkyo I have had for many years now.
As you have probably surmised, I have spent many hours on the internet trying to find a receiver compatible with my setup here, but with a USB port.
I have written all this just to let you know where I have been lately and to let you know that I had not simply disappeared.