stereoout/mic in - there is a standard. it evolved from
mono jacks (sleeve ground, tip live)
stereo (sleeve ground, tip left, ring right)
leaving the new second ring for mic/line input (the input is usefully grounded by the sleeve if mono or stereo jacks are used).
meteor - nice little app
I'll pop the axim on to the bench and test the input for levels etc. and report back...