I'm new to Logic and I'm having some basic difficulties. I usually monitor through headphones out of the back of the computer. As soon as I plug in the firewire of my analog to digital device (Presonus), Logic goes completely silent. Sound no longer comes out of the "headphones out" - not the other audio tracks that have already been recorded or software instrument tracks. I can only monitor by plugging headphones into the Presonus even though the computer's Preferences > Sound > Output is set for the internal speakers (not the Presonus), and I've clicked on "software monitoring", "input monitoring" in Logic. I hope there's some "internal speakers monitor" option somewhere. Many thanks for help in this regard.