| | Input questions
Well this question seems pretty simple, there are instances where on the surface it seems like it would work, in practice it fails epically (for an unrelated example: A coax cable single in, multiple out, if you screw it into an out the unit works, just very very badly)
So having a look at the 'flagship' Pioneer Unit, AVIC-Z120BT (questions should apply to many other HUs as well), what if you were to attach a small passive USB hub to the rear USB? So you could have an iPod cable connected, a USB extension cable connected (for flash drives), or other misc USB connections that might somehow contain music?
Or on a similar note, you plugged in a head phone splitter into the rear 3.5mm aux. audio jack for two different source ins?
**Something to note on all of this, I'm not asking would it work at the same time, I know you would have to be completely isolating on what is plugged into that channel**