Guitar plug directly in Galaxy Tab S2

[brnvrn]

The sound lack some presence, but  only use the Galaxy Tab S2 and Audio Evolution Amp simulator (and ToneBooster reverb).
https://soundcloud.com/brnvrn/idea-11-dr...with-audio 

The clean sound is really not too bad. 

I wonder how a 200€ iRig I/O would really make it better,  or if a just a preamp would do the trick ?  
How do you record guitar ???

Also the form factor is important, it is not that I need mobility, but I cannot let cables and stuff at all in the room.

Feedback welcome.   
Bruno