MIDI Tracer

The MIDI Tracer window
The MIDI Tracer window

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:

Porta 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 listwhere all the events for this port are listed, see below
Line historyhow many lines should be kept in the events list
Delta timesif checked, shows the times as the duration since the last event, instead of the absolute time
Decimalif checked, shows the MIDI data as decimal values instead of the original hexadecimal values
Enabledif checked, the events are displayed in the events list, otherwise stops the logging
Auto-Scrollif 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 eventeither 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 channelin 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

Note: The MIDI Tracer can lists all kind of MIDI events, "audio" ones, but also scene automation or timecodes ones.