155 lines
4.5 KiB
HTML
155 lines
4.5 KiB
HTML
<p>
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The <dfn>Transport Masters</dfn> dialog allows selecting a transport master
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(a timecode source) for Ardour to sync to, as well as tweaking additional
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settings.
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</p>
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<figure>
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<img style="width:75%;" src="/images/transport-masters.png" alt="Transport Masters">
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<figcaption>
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Transport Masters
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</figcaption>
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</figure>
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<p>
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Supported protocols are:
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</p>
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<ul>
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<li>JACK Transport</li>
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<li>MIDI Time Code (MTC)</li>
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<li>Linear (or Longitudinal) Timecode (LTC)</li>
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<li>MIDI Beat Clock, or MIDI Clock</li>
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</ul>
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<p>
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For each type of supported protocol it's possible to select the port
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to read timecode signal from, view sync position and drift (delta), see
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when any message was received the last time, and toggle additional
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options.`
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</p>
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<h2>Selecting a Transport Master</h2>
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<p>
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The dialog collects all transport masters information and settings in one
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place, however Ardour can sync only to one timecode source at a time.
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Clicking the radio button to the left of the master's name selects that
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transport master.
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</p>
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<p>
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It is necessary to also select an audio or MIDI port (depending on the
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protocol) to read timecode data from. Relevant ports are listed for each
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transport master in the dropdown list in the <dfn>Source</dfn> section.
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</p>
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<h2>Keeping Track of The Sync</h2>
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<p>
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<dfn>Format</dfn> displays the timecode format for each transport master
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depending on the specifics of that master's protocol. E.g. while MTC and
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LTC will display a frame rate such as 25 fps, MIDI Clock will be
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transmitting tempo such as 120 beats per minute.
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</p>
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<p>
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<dfn>Sync Position + Delta</dfn> displays current location as per timecode
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as well as the difference between current location in Ardour and the
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location per timecode source. This difference (delta) accumulates as long
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as Ardour's transport isn't rolling.
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</p>
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<p>
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<dfn>Last Message + Age</dfn> displays the latest location transmitted
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by the timecode source, as well as the time since the last transmission
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was received.
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</p>
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<h2>Setting Additional Options</h2>
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<p>
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It's possible to set several additional options.
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</p>
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<p>
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<dfn>Active Commands</dfn> makes it possible to perform certain types
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of actions in Ardour at the cost of decoupling from the transport master.
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Supported options are:
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</p>
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<ul>
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<li>Accept start/stop commands (displays 'Start/Stop' on the button)</li>
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<li>Accept speed-changing commands (displays 'Speed' on the button)</li>
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<li>Accept locate commands (displays 'Locate' on the button)</li>
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</ul>
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<p>
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When only one command is enabled, its short name will displayed at the
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button's caption (see above). When two out of three are enabled,
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the button's caption will be 'Complex'. When all three options are enabled,
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the caption will be 'All'.
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</p>
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<p>
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The easiest way to select two or three options at a time is to open the
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drop-down menu, use arrow up/down keys to navigate to the option of interest,
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the press <kbd class="button">Spacebar</kbd> to toggle that option without
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subsequently closing the drop-down menu.
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</p>
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<p>
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<dfn>Clock Synced</dfn> — when this option is enabled, the external
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timecode source is assumed to be sample-clock synced to the audio interface
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that is being used by Ardour
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</p>
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<p>
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<dfn>29.97/30</dfn> — when this option is enabled, the external timecode
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source is assumed to use 29.97 fps exactly rather than 30000/1001 (which is
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29.97002997).
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</p>
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<p>
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Both <dfn>Clock Synced</dfn> and <dfn>29.97/30</dfn> options are not
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applicable to <dfn>MIDI Beat Clock</dfn> that operates in the musical time
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domain and transmits beats per minute rather that seconds and frames.
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</p>
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<h2>Adding and Removing Custom Transport Masters</h2>
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<p>
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It is possible to <dfn>add</dfn> additional masters of the same type, e.g.
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two difference sources of LTC.
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</p>
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<p>
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Clicking <kbd class="button">Add a New Transport Master</kbd> opens a new
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dialog.
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</p>
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<figure>
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<img style="width:50%;" src="/images/add-transport-master.png" alt="Add a new transport master">
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<figcaption>
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Add a new transport master
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</figcaption>
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</figure>
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<p>
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It's usually a good idea to give the custom transport master a descriptive
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name, especially if there are multiple ones available using the same
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protocol.
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</p>
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<p>
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The next step is selecting the audio or MIDI port where the timecode signal
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will be coming from.
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</p>
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<p>
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Additional transport masters can be <dfn>removed</dfn> with a single click.
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Every custom transport master has a button with a crosshair icon
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<kbd class="button">X</kbd> to the right of the window. No confirmation
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will be asked upon clicking this button.
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</p>
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