livetrax/manual/xml/editing_concepts.xml

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<section id="sn-editing-concepts">
	<title>Editing Concepts</title>
	<para>
		In Ardour, "editing" describes the process of
	</para>

	<itemizedlist>
		<listitem>
			<para>
				making modifications to playlists. Recall that
				<glossterm linkend="gt-playlist">playlists</glossterm> are nothing more
				than lists of <glossterm linkend="gt-region">regions</glossterm> arranged
				over time.
			</para>
		</listitem>
		<listitem>
			<para>
				recording/modifying automation data
			</para>
		</listitem>
	</itemizedlist>

	<section id="editing-cut-copy-paste">
		<title> Cut/Copy/Paste </title>
		<para></para>
	</section>

	<section id="sn-snap-settings">
		<title>Snap Settings</title>
		<para>
			By default, when you move objects around, they move freely. There
			<emphasis>is</emphasis> a "granularity" to the motion, but it is a single
			audio frame (so typically on the order of 1/48000'th or 1/96000'th of a
			second), and at most zoom levels it will not be apparent in any way.
		</para>

		<para>
			However, this is not always the way you want to move some kinds of objects.
			If you are working with structured compositions that utilize traditional
			concepts of bars, beats, rythmn and so forth, you will often want to move
			regions so that that they always align to specific periodic time points
			that correspond to the start of a bar, or a beat etc. If you are working on
			a movie soundtrack, you may prefer to have regions always align to SMPTE
			frames, or perhaps even to whole seconds.
		</para>

		<para>
			Ardour provides a wide variety of "snap" settings. If any but "None" is
			selected, they define a grid of timepoints which will be used to "snap"
			object positions as they are dragged. The grid can be regular (as is the
			case if you choose "Beats", for example), or it can be completely irregular
			(if you choose "Marks", for example). It can even consist of a
			<emphasis>single</emphasis> timepoint (if you choose "Edit cursor", for
			example).
		</para>

		<variablelist>
			<title> Possible Snap Settings </title>
			<varlistentry>
				<term><guilabel>None</guilabel></term>
				<listitem>
					<para>
						no alignment used at all
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> CD Frames</guilabel></term>
				<listitem>
					<para>
						align to 1/75th of a second intervals, as defined by the "Redbook" Audio
						CD standards
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> SMPTE Frames</guilabel></term>
				<listitem>
					<para>
						align to whatever the current SMPTE frame interval is (defined in the
						options editor)
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> SMPTE Seconds</guilabel></term>
				<listitem>
					<para>
						align to whole seconds, adjusted to account for any SMPTE start offset
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> SMPTE Minutes</guilabel></term>
				<listitem>
					<para>
						align to whole minutes, adjust to account for any SMPTE start offset
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Seconds</guilabel></term>
				<listitem>
					<para>
						align to whole seconds
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Minutes</guilabel></term>
				<listitem>
					<para>
						align to whole minutes
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Beats/32</guilabel></term>
				<listitem>
					<para>
						align to 1/32 divisions of the beat
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Beats/16</guilabel></term>
				<listitem>
					<para>
						align to 1/16 divisions of the beat
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Beats/8</guilabel></term>
				<listitem>
					<para>
						align to 1/8 divisions of the beat
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Beats/4</guilabel></term>
				<listitem>
					<para>
						align to 1/4 divisions of the beat
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Beats/3</guilabel></term>
				<listitem>
					<para>
						align to 1/3 divisions of the beat
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Beats</guilabel></term>
				<listitem>
					<para>
						align to beats
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Bars</guilabel></term>
				<listitem>
					<para>
						align to the start of bars
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Marks</guilabel></term>
				<listitem>
					<para>
						align to the nearest mark of some kind
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Edit Cursor</guilabel></term>
				<listitem>
					<para>
						align to the current position of the edit cursor
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Region starts</guilabel></term>
				<listitem>
					<para>
						align to the nearest start of a region in the (first) selected track
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Region ends</guilabel></term>
				<listitem>
					<para>
						align to the nearest end of a region in the (first) selected track
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Region syncs</guilabel></term>
				<listitem>
					<para>
						align to the nearest region sync point in the (first) selected track
					</para>
				</listitem>
			</varlistentry>

			<varlistentry>
				<term><guilabel> Region bounds </guilabel></term>
				<listitem>
					<para>
						align to the nearest region start or end in the (first) selected track
					</para>
				</listitem>
			</varlistentry>
		</variablelist>

		<section id="changing-snap-settings">
			<title> To change snap settings </title>
			<para>
				Move the mouse pointer to the toolbar panel of the editor window. Click on
				the "expansion arrow" of the "Snap setting" chooser. This will popup a
				list of available snap settings. If necessary, scroll down to see your
				desired choice. Click on your choice in the list to dismiss it and make
				Ardour switch to the new setting.
			</para>

			<note>
				<para>
					Changing snap settings has <emphasis>no</emphasis> effect on the position
					of any existing region. Its effect is only on objects being moved.
				</para>
			</note>
			<tip>
				<para>
					The snap setting also affects moving the playhead, the edit cursor,
					loop/punch and location markers, and dragging/moving range selections.
				</para>
			</tip>
		</section>

		<section id="snap-mode">
			<title> Snap Mode </title>
			<para>
				There are two subtly different ways in which the snap setting can affect
				region motion:
			</para>

			<variablelist>
				<title></title>
				<varlistentry>
					<term>normal snap mode</term>
					<listitem>
						<para>
							regions can only be moved to positions defined by the snap setting. It
							is not possible to move them to intermediate positions.
						</para>
					</listitem>
				</varlistentry>

				<varlistentry>
					<term>magnetic snap mode</term>
					<listitem>
						<para>
							regions can still be moved to positions not defined by the setting, but
							they "stick" to the timepoints that are when dragged across them.
							Imagine that the timepoints and the regions are magnetic - or just try
							it and see.
						</para>
					</listitem>
				</varlistentry>
			</variablelist>

			<para>
				However, you can press the <emphasis>snap modifier</emphasis> key while
				dragging, and the snap setting will be ignored. By default, this is the
				key on your keyboard that generates <emphasis>Mod3</emphasis> , but you
				can modify this from the <emphasis>Options Editor</emphasis> keyboard tab.
			</para>
		</section>

		<section id="changing-snap-mode">
			<title> To change snap mode </title>
			<para>
				Move the mouse pointer to the toolbar panel of the editor window. Click on
				the "expansion arrow" of the "Snap mode" chooser. This will popup a list
				of available snap settings. If necessary, scroll down to see your desired
				choice. Click on your choice in the list to dismiss it and make Ardour
				switch to the new setting.
			</para>
		</section>
	</section>
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