If you have 2 inputs you can create an aggregate device in audio midi settings and run them as 2 separate tracks garageband, place the mics where you want, adjust each track separately. It's a little fiddly to find the settings and I think you may have to get the mac sound settings correct, as well. There's probably also youtube tutorials. I use a Shure MV51 and an apogee iMIC
https://support.native-instruments.c...e-Device-OS-X-