[Q] Oscillator Project topic

Hi there,

I got this old tab 2 7, on my shelf for over a year now and I've decided to make it useful again.
So, as a musician, I thought it would be nice to have a Signal monitor/Oscillator that is always on
and connected to one of the out's of my Audio interface (2 x 6.3mm)..

I did some exploring and found an app and a nice Samsung-plug to 3 x female-usb.
1 usb will be used for power.
And here is the problem, I can't find a stereo to usb cable ANYWHERE!
I got all sorts of plugs, cables and adapters, but it's useless unless I'll find a way to
feed in the tablet a Line In which is stereo.

Any ideas?

Thanks in advance!