Oops problem solved, it seems my OTG cable is the problem, try other cable and it works fine now :)

I have musiland mx04 dac works perfectly fine with my android OTG, however my ap60 is not recognise it in otg mode. When i use my dragonfly dac is working fine in ap60 OTG Is there any idea how to make my musiland mx04 dac works in ap60 OTG? Thanks