Mounting Rails for PCB mounting
The mounting rails can be used for stabilization (the lid can be attached to the middle of the mounting rails)

And the mounting rails can be freely mounted on the side panels in the case. Circuit boards can thus be fixed easily and securely.

Huge advantage:
While switches are wired at the front and XLR connectors are wired at the back, measurements and soldering can still be carried out from above and below when the board is installed!