Set <kbd class="menu">Settings > MIDI Driver</kbd> to <kbd
class="input">none</kbd>.
Then uncheck the <kbd class="optoff">Misc > Enable ALSA Sequencer
Set <kbd class="menu">Settings > MIDI Driver</kbd> to <kbd
class="input">none</kbd>.
Then uncheck the <kbd class="optoff">Misc > Enable ALSA Sequencer