While not perfect because it only has two dedicated stereo inputs, the USB in/out is shared with the tape in/outs, it has little routing capability and it looks disturbingly like a Behringer, the Alesis Multimix 8USB is on sale at Guitar Center this week for $150. If all you need is a cheap way to get a few audio sources including phantom powered mics into FCP via USB and do some basic monitoring, than this might do the trick. Check the owner’s manual for more details.
Product Info
https://www.alesis.com/products/multimix8usb/index.html
Owner’s Manual
https://www.alesis.com/downloads/manuals/MultiMixUSB%208.pdf
Guitar Center online store
https://www.musiciansfriend.com/srs7/fg=62/g=home/search/detail/base_id/119001
-Carl Jacobs