The port that is transmitting the note messages might not be "ON."
Check the setting as follows.
- Refer also to “MC-707 Update.”
- Hold down the [SHIFT] button and press the TRACK SEL [1]-[4] button of the track whose setting you want to change.
- The setting screen appears. - Use the cursor [<] [>] button to select “MIDI.”
- Use the cursor [∧] [V] button to select the port that transmits note messages (TxMIDI Out, TxUSB MIDI).
- Use the [4] knob to turn it “ON.”