I practice with my computer (Online drum tracks, Spotify, etc) and bass into a small mixer and want to be able to record this back to computer. I’m on Mac OSX high Sierra. What would the cheapest and easiest method to accomplish this? I have two mixers, an alto zmx52 and a behringer xenyx 1204 mixer, neither of which is a usb mixer. I presume I’d need some sort of usb interface but have no idea what to get and how to record to my computer. Any help? Thanks!