Using Apple Logic X and IMac, I want to record my guitar tracks and put some keyboards and drums on it. I already have a guitar Effects&Amp simulator which also acts like an audio interface so I can connect my guitar to my Mac. And at the moment actually I can record guitar and make some music tracks.
My question is that I heard I need an external soundcard for good recording. What would be the advantage of spending en extra 200$ on this? I may understand that it will be less overhead on my computer's CPU and maybe less latency, but does that really change the quality of drums and keyboards that I create with logicX? When I say quality I mean does it make my synthesized sounds more realistic and less digital? Or does it only improve the quality of guitar track recordings?