The tool you need for summing to an analog mixer.
The Solid State Logic X-Rack 8-Input Module is the essential module for creating a Super Analogue summing mixer. This X-Rack module is designed to provide high channel counts, such as when bringing large numbers of audio channels out of a DAW and onto an analogue mix bus. The 8-input module assures the depth and space that only summing outside of the box in the analogue domain can achieve.
Please note: The XR624 X-Rack 8-Input Summing module operates in conjunction with the XR622 X-Rack Master module.