Gaui 330x does not hold altitude

[gencode]

My 330x does not hold altitude, it only has a GU-344, is there a way to get it to hold basic altitude, I tried tweaking about everythign without success.
It flies well but its kinda constant movement of the stick, just want to see if i can improve it.
Ive adjusted the gyro a lot both ways without success

 

[Muhkuh]

The GU-344 doesn't have any sensors to sense the altitude. So it is unable to hold altitude. It will just level the copter.

 

[Bowley]

The GU344 does have an expansion port. I presume was intended for GPS. unfortunately it never did get developed, rather they released the newer GU-INS with GPS. GU-344 is a very fun FC though, had much fun hacking about with it.