currently I'm on Android 5.1.1 on a huawei t2 tablet (as Samsung devices seem not to work even when rooted and 'cleaned' because of some strange USB-driver issue - I had a Samsung 10.1 A6 [Android 6.0.1] before which only had destorred sound output via Controller Master Out and no cue pre-out via controler headphone out).
As described before everything works perfect besides the headphone out of the Pioneer DDJ WeGo3. Using algoriddim djay 2 I have pre-cueing via headphone out (but it's a shitty app regarding fx etc.).
I'd love to use Cross DJ Pro, but pre-cueing is imossible by now as I can only use master out...
And I don't want to use DJ splitter cable as it's double mono then ...