Make sure you have MIDI In/Out Enabled on the X32.
Setup > Remote > MIDI Control Interface
It should be noted that the X32 MIDI is for controlling the X32. It can also be used to control an external device (i.e. control surface). It is not a general purpose MIDI interface like you'd find on an audio interface.
Edit: AFAIK, the USB cable is for 32x32 audio only.
Ken
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