The MIDI Tracer is similar to the MIDI List Editor, in the way that it displays MIDI information as a tabular text view, and has a vertical flow, i.e. the events follow a top to bottom time order.
Its use is different though, as it is not bound to a specific region or track: the MIDI that is monitored is any global input or output Ardour presents to the system. It is hence a very useful option to monitor a MIDI port, be it an external controller/device or the in/output of any track.
It is accessed by selecting the Window > MIDI Tracer menu.
The window is made of:
|Port||a list of all the MIDI ports Ardour presents to the system. They are both internal and external and are the same ports Ardour presents to JACK, if enabled.|
|the events list||where all the events for this port are listed, see below|
|Line history||how many lines should be kept in the events list|
|Delta times||if checked, shows the times as the duration since the last event, instead of the absolute time|
|Decimal||if checked, shows the MIDI data as decimal values instead of the original hexadecimal values|
|Enabled||if checked, the events are displayed in the events list, otherwise stops the logging|
|Auto-Scroll||if checked, the events list scrolls as new events are logged, allowing to keep the newest events on screen|
The events list displays the events as columns:
|time of the event||either absolute or relative, based on the Delta times checkbox|
|MIDI status (event type)||what midi events happened (e.g. Note On, Note Off, Pitch Bend, …)|
|MIDI channel||in which MIDI channel did the event happen|
|MIDI data bytes (event parameters)||parameters of the event, e.g. for a Note On: what note was it, and which was the note's velocity|