I am here with the same issue - low volume (extremely) out of the Headphone Out 1/8" port on the Sonic Port. I have not yet tested the 1/4" output.
I just opened a ticket as well. My iPad's headphone jack is roughly 10x louder than the headphone jack in the Sonic Port. This just cannot be correct.
Adding a compressor and turning the amp up (as stated in an earlier post) is a simply ridiculous answer. I bought this unit BECAUSE it had its own line/phones outputs, and other competing interfaces don't. If this turns out to be a class problem, I would have been better off with a competitor's unit (Apogee, etc.).
If anybody figures out a fix, will you please post it here?
Thanks!
