I have this problem.I use a Behringer Xenyx 502 and i use the adapter from 3.5 to 6 mm to connect the gameboy to the mixer.The thing is i have a problem.For one song i'm making i can hear every sound when i play it when the 3.5-6mm adapter is fully pushed in.Though for every other song i can only hear one part and i have to take out the adapter out of the mixer port a bit to hear everything fully...Can someone explain me this.And it's defiantly not because of the adapter i tried 3 even a RCA to 6mm adapter.
All adapters are mono though.Might be that,but just to make sure you know all details.When i plug the gameboy through RCa cable to rca port of mixer all is fine.So don't know if it's the port for the 6mm jack or it's something different like adapters.
THANKS IN ADVANCE PEEPS