Hello! haha i am a DJ and i use my MacBook Pro for everyday mixing and practicing now my set-up is a Numark iDj3 controller and an M-Audio X-Session Pro for effects I use virtual dj Pro version 7 and my problem was.... my MacBook can take the load of me mixing and using an external sound card.... but i was board and wanted to make a youtube video of me mixing.... i wanted good sound so i opened Photobooth and "piped" audio from my mixer to the audio input on the MacBook, went into system prefs and set every thing up... now when i mixed and recorded at the same time it kept freezing.... and stoping... then came the beachball... so what affects the preformance... what should i do if i want to make a youtube video... and get clean sound