Video Devices PIX-LR attaches to either the Video Devices PIX-E5 or PIX-E7. It adds XLR inputs and outputs, faders and buttons. The preamps are the same that Sound Devices uses and are very good and clean. This unit is used but works perfectly. I used it as an add on to my director's monitor but don't use it so decided to get rid of it. Sells new for $400. Selling for $175. Located in Los Angeles.
https://www.bhphotovideo.com/c/product/1140405-REG/video_devices_pix_lr_xlr_audio_interface_for.html
https://www.bhphotovideo.com/c/product/1140405-REG/video_devices_pix_lr_xlr_audio_interface_for.html