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Hi teknik99

I’m afraid you have been given some incorrect advice.

You can connect the MMO module iDR Ports directly into an iDR-outD expander. You do not need to connect an iDR4/8. Though connecting to and iDR4/8 is also possible.

If you wish to connect an MMO module to an iDR4/8 you only need to connect the Audio socket.
If you wish to connect an MMO module directly to an iDR-Output Expander you will need to connect both Audio and DR-Link sockets, the DR-Link soecket provides the metering data for the LED’s on the front panel.

Hope that helps.

Sam A&H