178 lines
5.7 KiB
HTML
178 lines
5.7 KiB
HTML
---
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layout: default
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title: Transport Tab
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menu_title: Transport Tab
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---
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<p>
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This tab contains settings that relate to the behavior of the
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<a href="/controlling-playback/using-the-transport-bar/">Transport Bar</a>
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and <a href="/synchronization/">Synchronization</a>.
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</p>
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<img src="/images/a4_preferences_transport.png" alt="preferences
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transport tab"/>
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<ul>
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<li>
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<p>
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<strong>Keep record-enable engaged on stop</strong> leaves the global
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record-enable engaged after transport is stopped. Does not affect track
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level record-enable which is never changed on stop.
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</p>
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</li>
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<li>
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<p>
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<strong>Play loop is a transport mode</strong> changes the behavior of the
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loop button, turning it into a toggle. When enabled, the loop button does
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not start playback but forces playback to always play the loop. Looping
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stays engaged when the transport is stopped. Playback continues where the
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transport stopped and continues to loop.
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</p>
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<p>
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When disabled, the loop button starts playing the loop but stop then
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cancels loop playback.
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</p>
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</li>
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<li>
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<p>
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<strong>Stop recording when an xrun occurs</strong> will stop the transport
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when an xrun occurs during recording, ensuring no audible glitches are
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recorded.
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</p>
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</li>
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<li>
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<p>
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<strong>Create markers where xruns occur</strong> will create a new
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<a href="/working-with-markers/">marker</a> when an xrun occurs during
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recording at the location of the xrun. This marks where possible xruns
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might produce audible glitches when stopping on xruns is disabled.
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</p>
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</li>
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<li>
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<p>
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<strong>Stop at the end of the session</strong> causes the transport to
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stop during playback when it reaches the end marker. Behavior during
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recording is not changed.
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</p>
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</li>
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<li>
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<p>
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<strong>Do seamless looping</strong> removes any clicks that might
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otherwise be audible when the transport moves from the end of the loop
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range back to the beginning.
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</p>
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</li>
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<li>
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<p>
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<strong>Disable per-track record disarm while rolling</strong>, when
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enabled, will not allow the any track's record-enable to be disarmed
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during record, preventing accidentally stopping the recording of a take.
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</p>
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</li>
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<li>
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<p>
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<strong>12dB gain reduction during fast-forward and fast-rewind</strong>
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when enabled will reduce the unpleasant increase in perceived volume
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that occurs when fast-forwarding or rewinding through some kinds of audio.
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</p>
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</li>
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<li>
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<p>
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<strong>Sync/Slave</strong>
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<ul>
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<li>
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<p>
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<strong>External timecode source</strong> determines which external
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source to use when Ardour is using an external
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<a href="/synchronization/">synchronization</a> source. Depending
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on the timecode source chosen, additional preference options are
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available.
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</p>
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</li>
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<li>
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<p>
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<strong>Match session video frame rate to external timecode</strong>
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controls the value of the video frame rate <em>while chasing</em>
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an external timecode source.
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</p>
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<p>
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When enabled, the session video frame rate will be changed to match
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that of the selected external timecode source.
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</p>
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<p>
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When disabled, the session video frame rate will not be changed to
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match that of the selected external timecode source. Instead, the
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frame rate indication in the main clock will flash red and Ardour
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will convert between the external timecode standard and the session
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standard.
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</p>
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</li>
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<li>
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<p>
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<strong>Sync-lock timecode to clock</strong> can disable drift
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compensation.
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</p>
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<p>
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When enabled, Ardour will never varispeed when slaved to external
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timecode. Sync Lock indicates that the selected external timecode
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source shares clock-sync (Black & Burst, Wordclock, etc) with
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the audio interface. This options disables drift compensation.
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The transport speed is fixed at 1.0. Vari-speed LTC will be ignored
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and cause drift.
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</p>
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<p>
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When disabled, Ardour will compensate for potential drift regardless
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if the timecode sources shares clock sync.
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</p>
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</li>
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<li>
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<p>
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<strong>Lock to 29.9700 fps instead of 30000/1001</strong>, when
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enabled, will force Ardour to assume the external timecode source
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uses 29.97 fps instead of 30000/1001.
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SMPTE 12M-1999 specifies 29.97 df as 30000/1001. The spec
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further mentions that drop-frame timecode has an accumulated error
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of -86 ms over a 24 hour period. Drop-frame timecode would
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compensate exactly for an NTSC color frame rate of 30 * 0.9990 (i.e.
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29.970000). That is not the actual rate. However, some vendors use
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that rate - despite it being against the specs - because the
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variant of using exactly 29.97 fps has zero timecode drift.
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</p>
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</ul>
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</p>
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</li>
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<li>
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<p>
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<strong>LTC Reader</strong> specifies which incoming port will provide
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the LTC signal.
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</p>
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</li>
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<li>
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<strong>LTC Generator</strong>
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<ul>
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<li>
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<p>
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<strong>Enable LTC generator</strong>, when enabled Ardour will
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output an LTC timecode signal on it's <em>LTC-out</em> port.
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</p>
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</li>
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<li>
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<p>
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<strong>Send LTC while stopped</strong>, when enabled Ardour will
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continue to send LTC information even while the transport (playhed) is
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not moving.
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</p>
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</li>
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<li>
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<p>
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<strong>LTC generator level:</strong> specifies the peak volume of
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the generated LTC signal in dbFS. A good value is 0dBu^=-18dbFS in an
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EBU calibrated system.
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</p>
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</li>
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</ul>
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</li>
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</ul>
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