Here are some useful MX980 discrete commands for the NAD C368 Integrated Amp:

For discrete source input selection:

PhonoUse the NAD C356 Tape1 IR command
TunerUse the NAD C356 Tape2 IR command
CDUse the NAD C356 CD IR commandCD
BluetoothUse the NAD C390 Input4 IR command

For Vol+/- Use the NAD C356 Vol+/-Repeat 3, Minimum repeat 2

Commands were loaded via the IR database navigator.

Hope this is of use.