Myself and the Community College Theatre I work in us QLab. The student/staff (myself and friends) as well as the staff (if/when they use QLab) all use MacBooks/MacBook Pros. The college has a PreSonus FireStudio which is used as a DAC to input into our sound board. (Use of the built in DAC and line amps in the laptops produces a terrible sound.) I personally own and use a Focusrite Saffire Pro 24 interface. QLab (Mac OSX) Figure53.com Price ~ $1-500 (dependent on license type: Daily-Full non expiring license.) PreSonus FireStudio Presonus.com Price ~ $500 Focusrite Saffire Pro 24 focusrite.com Price ~ $299 This setup has been 100% reliable, can run multimedia as well. The audio interface doubles as a unit to capture and record live sound and playback audio.