From what little I can tell, you are probably using an RME interface with multiple digital and analog outputs. I can't really speak to how to address that device. I would guess that the device specific driver/app the comes with it lets you control where the signal goes, but that's a TOTAL GUESS.
The sampling rate I believe I can help with. MC does not obey any system settings in Audio/MIDI for sample rate. By default MC wants to play files at their native sample rate. It plays 44.1 as 44.1 and 96 as 96. But if you want everything re-sampled to 96 instead, you can easily do that with DSP studio.
Open DSP Studio.
Make sure Output format is checked to on.
In Output Format, RIGHT CLICK on the output column. You should see a menu to allow you set everything to a single sample rate. Choose "set all to 96000". The output column should now show 96kHz for all input rates.
Close the DSP studio.
Now stop and restart playback and everything should be resampled to 96k.
Brian.