manual/include/midi-tracer.html

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<figure class="right">
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<img src="/images/midi-tracer.png" alt="The MIDI Tracer window">
<figcaption class="center">
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The MIDI Tracer window
</figcaption>
</figure>
<p>
The <dfn>MIDI Tracer</dfn> window, which is accessed by selecting <kbd
class="menu">Window &gt; MIDI Tracer</kbd> from the main menu, is similar to
the <a href="@@midi-list-editor">MIDI List Editor</a> in that it displays
MIDI information as tabular text, and has a vertical flow (i.e. the
events follow a top to bottom time-oriented order).
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</p>
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<p>
Its use is different however, as it is <em>not</em> bound to a specific
region or track; the MIDI shown in the MIDI Tracer window is any global input
or output Ardour presents to the system. As such, it is a very useful way to
monitor MIDI traffic, whether it is an external controller or device or the
input or output of any track.
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</p>
<p class="note">
The MIDI Tracer can list all types of MIDI and "audio" events, and <a href="@@midi-scene-automation">scene automation</a> and <a href="@@timecode-generators-and-slaves">timecode</a> events as well.
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</p>
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<p>
The window consists of:
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</p>
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<table class="dl">
<tr>
<th><dfn>Port</dfn></th>
<td>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</td>
</tr>
<tr>
<th>The events list</th>
<td>Where all the events for this port are listed, see below</td>
</tr>
<tr>
<th><dfn>Line history</dfn></th>
<td>How many lines should be kept in the events list; once this limit is
reached, older events will be removed from the list</td>
</tr>
<tr>
<th><dfn>Delta times</dfn></th>
<td>If checked, shows the times as the duration since the last event, instead
of <a href="@@on-clock-and-time">absolute times</a></td>
</tr>
<tr>
<th><dfn>Decimal</dfn></th>
<td>If checked, shows the MIDI data as decimal values instead of
hexadecimal</td>
</tr>
<tr>
<th><dfn>Enabled</dfn></th>
<td>If checked, events are displayed in the events list as they occur,
otherwise stops the logging</td>
</tr>
<tr>
<th><dfn>Auto-Scroll</dfn></th>
<td>If checked, the events list scrolls as new events are logged, keeping the
newest events on screen</td>
</tr>
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</table>
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<p>
The events list displays the events as columns:
</p>
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<table class="dl">
<tr>
<th>Time of the event</th>
<td>Either absolute or relative, based on the <kbd class="option">Delta
times</kbd> checkbox</td>
</tr>
<tr>
<th>MIDI status (event type)</th>
<td>What MIDI events happened (e.g. Note On, Note Off, Pitch Bend, etc.)</td>
</tr>
<tr>
<th>MIDI channel</th>
<td>The MIDI channel the event happened in</td>
</tr>
<tr>
<th>MIDI data bytes (event parameters)</th>
<td>Parameters of the event, e.g. for a Note On: what the <a
href="@@midi-notes-ref">note</a> was, and its velocity</td>
</tr>
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</table>
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