Try re-setting the MIDI channel on the Mintaur. You can do this on the instrument itself by pressing all four of the buttons on the front panel (Both Oscillator Wave Selectors, RELEASE ON/OFF, and GLIDE ON/OFF) at the same time and they should start to blink. Now send a MIDI note from the MIDI source to the Minitaur and all of the buttons should stop blinking.
The Minitaur’s MIDI Channel has now been changed to the Channel that the MIDI note was sent from.
If you are still having trouble after this, please contact firstname.lastname@example.org.