The following modules can use the X-Racks internal mix or rec buses:
- The XR622 Master Bus is required to use the buses.
- XR621 Mic Amp has two switches to route to the REC bus left, right, or both.
- XR627 VHD Input has two switches to route to the REC bus left, right, or both.
- XR623 Four Channel Input - Originally, each input could feed either the MIX or the REC bus. With X-Rack V1.3/1 or later, a setup option is added so that all inputs can constantly feed the MIX Bus, and can also optionally feed the REC bus (this is a global option for all inputs).
- XR624 Eight Channel Input can can either feed the MIX bus or be switched off.