M-AUDIO Delta RBUS - Manual (Page 44)

5. In order to monitor the digital signal coming into the R-BUS, switch to
the Patchbay/Router page of the control panel software. In the "H/W
Out SP/ANA" column, select the radio button named "SP/ANA In."
This will copy all S/PDIF input audio directly over to the analog
outputs – therefore in this example, the monitor mixer will be
completely bypassed. Once this assignment is made, you may play the
DAT material at any time and verify that the signal is making it into the
Delta R-BUS successfully. This can be done regardless of whether or not
your recording software is open.
6. Within your recording software, select "SP/ANA In Delta-R-BUS," as
the audio input device. The Delta input appears as a stereo pair, or as
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