MIDI driver: selects the MIDI driver Hydrogen will use to send MIDI messages.
Input: selects the device Hydrogen will expect MIDI messages to receive from.
Output: selects the device Hydrogen will send MIDI messages to.
Channel: specifies whether Hydrogen should listen to MIDI messages on one particular of the 16 available channels or on all of them.
Ignore note-off: specifies whether Hydrogen will respond to the note-off MIDI message.
![[Note]](../img/admonitions/note.svg)
Note This makes better use of the drumkit samples used in Hydrogen when working with certain external MIDI devices. But it may also discard Cymbal choke messages in some e-drums.
Enable MIDI feedback: specifies whether Hydrogen will send a message about updated values every time a certain parameter is changed. These parameters are
Discard MIDI messages after action has been triggered: specifies whether a MIDI note - after performing the MIDI action associated with it - should be played back or be discard.
Use output note as input note: specifies whether the output MIDI note of an instrument specified in the MIDI Out Settings of the Instrument Editor should be used to map the input as well.
Note If this option is unchecked, only the currently selected instrument will used to play back the received MIDI notes.
Using the table in the lower part of the tab you can associate MIDI actions provided by Hydrogen with incoming MIDI messages. How this is done will be explained in the Section 16.1.