Aftertouch events

Aftertouch (or channel pressure) events are generated by a mechanical pressure sensor beneath some MIDI keyboards. These events can be used to modulate the synthesizer sound. All note events on a particular MIDI channel are affected. This means that applying pressure to one note in a held chord affects all notes in the chord.

Figure. Event List showing aftertouch events.
  • Ch(annel): MIDI channel of an event from 1 to 16.

  • Num(ber): This column is unused, as aftertouch events only have one data byte.

  • Val(ue): Displays the amount of pressure on the keyboard (0 to 127).