I want to get into music production using Logic Pro X - currently have the early 2015 13" rMBP (2.9 ghz i5, 16gb ram, 512gb ssd). I will be recording two tracks simultaneously, guitar and vocals and then will add in drums, piano, electric guitar and possibly bass afterwards. Is it powerful enough to run Logic smoothly and without overheating or should I exchange for the base 15" rMBP? Only have a week left to decide if I want to return. I like the portability of the 13", size and weight but don't want to get into a situation where I regret spending $2k for it and lack the power for music production and should've gotten the 15" despite the heavier weight and being less mobile. I also have an external monitor at home so don't really need the 15" screen size - it would be more for the quad core and gpu power. Any insights would be appreciated.