I've just bought a iRIG QUATTRO and want to use this as an guitar interface. However when I use AmpliTube on an iOS device I can't get any signal on the headphone output of the interface. I can get direct feedback, yes (using the switch on the interface), but if I want to get the processed signal via AmpliTube back to the interface on the headphone port it does not work. I had a iRIG PRO duo as well. When I simply change the interface to PRO DUO it works completely fine but with the Quattro it does not. I've tested all four channels.
BUT: If I use Amplitube on the MAC Computer, it does work (!).
What am I doing wrong?
Any help appreciated.
Thanks.