We've published an article explaining the recording features of MACKIE's high-quality, multi-functional analog mixers, the “Onyx Series.”
The Onyx Series supports USB multitrack recording for music production and SD card stereo recording for live sound capture.
This article shows you the actual steps for recording, complete with real operation screens. Be sure to check it out.

Trying out multitrack recording and stereo recording with the MACKIE Onyx Series!!
MACKIE/Onyx Series