Oh right, I didn’t realise that you actually had a card already. With the DX32 connected, go the appropriate I/O screen ‘Outputs’ tab. In this page, the top row shows the individual DX outputs 1-32. If you touch the output associated with your digital output card, it will open a dialog box where you can change the settings for this output, including sample rate. Similar dialogs exist for other outputs. You can also touch inputs in the left hand column, to change their name and colour.
Before you say it, I agree that it is not obvious these column/row labels are actually buttons as well.
Cheers
– Jeff, A&H