I bought an HX Stomp primarily to have great tone through headphones while taking online guitar lessons (youtube, justinguiitar, etc). I have plugged a stereo 1/8 inch to two 1/4 inch to run from the headphone jack on a macbook pro to the return jacks on the Stomp and in the global settings of the Stomp I changed the fx return jacks from Instrument to Line. When I turn youtube volume up all the way and the macbook pro volume up all the way, I can hear it, but it is not loud enough to jam along with. I cannot find a way within the Stomp to increase the aux in volume relative to the guitar volume to make the Stomp useable for this purpose. Am wondering if anyone knows how to do this or otherwise has any ideas? Thanks.