Hello! I was used to work in analoge studio . But as I dont have any more access to analoge studio, I got a digital studio( mac with ableton, manitor, controler, keyboard, sound card and microphone). I have also loop station 505. As I have low budget and also would like to have some analoge synth, I wonder if I would need sound card beside loopstation? And what is the purpose of sound card in general?