With four XLR/TRS combo inputs, a 3.5mm stereo input, and a Zoom mic capsule input, the F4 can record up to six discrete tracks with an additional stereo mix track—all at resolutions up to 24-bit/192 kHz.
Input 5/6 can be used as a camera return for monitoring only. This allows you to monitor audio being sent to the camera for confidence checks.
Dual SD card recording
A dual SD card recording feature lets you record simultaneously on two SD/SDHC/SDXC cards* (up to 512 GB each). This means you can instantly back up or split recordings. For example, you can save eight tracks on one card and a stereo mix on another.