Billy,
It is easy.
There are couple of chord & harmony exploring apps that I use and they are only available on ipad. I use such apps as reference tools when building out a progression in BIAB... I need to be able to "hear" those apps while I use BIAB. Also, it has to be through headphones. So, two separate outputs to single headphones.
Yes, I looked at that "little bear" mixer earlier. Cheap enough, but... I was hoping there is some sort of special and basic (without knobs etc) Y cable with resistor or such, that would prevent one output leaking signal to another, because that is what I am getting if I use a splitter similar to the one in attachment and it creates clicks/distortion. Maybe there is no such thing. I do not know

Misha.