Hi,
I just discussed this with some of the engineers, and in addition to the recommendations in my previous post they also mentioned that you could be getting some odd phase issues depending on your input signal, and where your output signal is going. The Looper only runs as a mono effect, so the input stereo signal gets summed – this means if you're running stereo and one of the input channels has the inverse phase of the other, the two signals will cancel each other out. Likewise, the output signal is dual mono – the looper is sending the same wet signal to both channels (although, I'm not 100% sure if that's true for the dry signal as well – hence why there may not be much dry signal going to channel 2).
Thanks,
Nikhil