so yeah, pretty much what the title says. i just bought my audio technica at2020 usb microphone today after looking around at the stellar reviews. lo and behold when i booted up my garageband, i found out that i can only seem to choose one audio driver to work at one given time: either the at2020 driver or the apogee duet driver. is there any way for me to use these two simultaneously for multitrack recording (i'd like to record stereo guitar on the duet and vocals on the at2020) on garageband?

side note: i found that i can use imovie to record the at2020 while garageband is using the duet, and then eventually importing the whole video file onto garageband. it's a huge compromise and a huge hassle, not to mention there's no way to monitor my vocals. basically it's just forcing the issue.