I just picked up this preamp used and have a few questions about patching options. Does anyone know what the output jack is on the front panel? There are output, high, and low jacks on the back and a headphone out on the front. This other jack just says output. There is also a footswitch jack - any clues what it switches? Is the xlr out affected by the gain control? Is it pre-EQ? Is there a way to blend the effects return input with the regular input so I can run straight and affected signals together? I tried to run a guitar with an LRBaggs DI through the return and it cut out my bass signal all together. Unfortunately I haven't been able to locate a manual. Any help is appreciated.