Hi, I need a little help,  I'm a newbie on this...

I know my code 50 doesn't have a "line out" but it features a headphone out, can I conncet the amp to a Yamaha mixer? I want to control my guitar volume with the mixer, plus a mic and an acoustic guitar.

If that is possible, how should I set the master volume, the preset volume and the gain in my marshall?

thnak you!