66 lines
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66 lines
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<!doctype html><html lang=en><head><meta charset=utf-8><meta name=viewport content="height=device-height,width=device-width,initial-scale=1,minimum-scale=1"><meta name=generator content="Hugo 0.98.0"><meta name=generator content="Relearn 3.4.1+tip"><meta name=description content="What is digital audio?"><title>What is digital audio? :: Ardour tutorial</title><link href=/ardour-tutorial/css/nucleus.css?1652723066 rel=stylesheet><link href=/ardour-tutorial/css/fontawesome-all.min.css?1652723066 rel=stylesheet><link href=/ardour-tutorial/css/featherlight.min.css?1652723066 rel=stylesheet><link href=/ardour-tutorial/css/perfect-scrollbar.min.css?1652723066 rel=stylesheet><link href=/ardour-tutorial/css/auto-complete.css?1652723066 rel=stylesheet><link href=/ardour-tutorial/css/theme.css?1652723066 rel=stylesheet><link href=/ardour-tutorial/css/theme-blue.css?1652723066 rel=stylesheet id=variant-style><link href=/ardour-tutorial/css/variant.css?1652723066 rel=stylesheet><link href=/ardour-tutorial/css/print.css?1652723066 rel=stylesheet media=print><style>:not(pre)>code.copy-to-clipboard-code+span.copy-to-clipboard-button{display:none}:not(pre)>code.copy-to-clipboard-code{border-bottom-right-radius:2px;border-top-right-radius:2px;border-right-width:1px}</style><script src=/ardour-tutorial/js/variant.js?1652723066></script>
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<span id=toc-menu title="Table of Contents"><i class="fas fa-list-alt fa-fw"></i></span><ol class=links itemscope itemtype=http://schema.org/BreadcrumbList><meta itemprop=itemListOrder content="Descending"><li itemscope itemtype=https://schema.org/ListItem itemprop=itemListElement><meta itemprop=position content="3"><a itemprop=item href=/ardour-tutorial/en/><span itemprop=name>Home</span></a> ></li><li itemscope itemtype=https://schema.org/ListItem itemprop=itemListElement><meta itemprop=position content="2"><a itemprop=item href=/ardour-tutorial/en/introduction/><span itemprop=name>Introduction</span></a> ></li><li itemscope itemtype=https://schema.org/ListItem itemprop=itemListElement><meta itemprop=position content="1"><a itemprop=item href=/ardour-tutorial/en/introduction/what-is-digital-audio/ aria-disabled=true><span itemprop=name>What is digital audio?</span></a></li></ol></div><div class="default-animation progress"><div class=wrapper><nav id=TableOfContents><ul><li><a href=#frequency-and-gain>Frequency and Gain</a></li><li><a href=#peaks-and-clipping>Peaks and Clipping</a></li><li><a href=#sample-rate-and-bit-depth>Sample Rate and Bit Depth</a></li><li><a href=#continuing>Continuing</a></li></ul></nav></div></div></div></nav><main id=body-inner class=highlightable><div class=flex-block-wrapper><div id=head-tags></div><article><h1>What is digital audio?</h1><p><strong>Ardour</strong> is a digital audio workstation (DAW). Beforing using it to
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record and edit sound, it might be useful to review how digital audio
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works.</p><h2 id=frequency-and-gain>Frequency and Gain</h2><p>Imagine a loudspeaker. To move the air in front of it and make sound,
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the membrane of the speaker must vibrate from its center position (at
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rest) backwards and forwards.</p><p>The number of times the membrane vibrates each second determines the
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<em>frequency</em> (the note, or <em>pitch</em>) of the sound you hear. The distance the
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membrane travels from its resting point determines the <em>amplitude</em> (the
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volume, or <em>loudness</em>) of the sound. Normally, we measure frequency in
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<em>Hertz</em> (Hz) and amplitude in <em>decibels</em> (dB).</p><p>A microphone works like a loudspeaker in reverse: vibrations in the air
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cause its membrane to vibrate. The microphone turns these acoustic
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vibrations into an electrical current. If you plug this microphone into a
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computer’s sound card and start recording, the sound card makes thousands
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of measurements of this electric current per second and records them as
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numbers. The number of <em>samples</em> (i.e. measurements) made per second is
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called the <em>sample rate</em>, and the number of possible values each sample can
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have is called the <em>bit depth</em>. The combination of sample rate and bit
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depth indicates how closely the digital signal can reproduce the sound it
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has recorded.</p><h2 id=peaks-and-clipping>Peaks and Clipping</h2><p>When Ardour displays the samples which have been recorded, they appear as
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the <em>waveform</em> we see below. The center horizontal line indicates the
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membrane of the speaker at rest, and the <em>peaks</em> of the waveform indicate
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the maximum <em>amplitude</em>.</p><figure><img src=en/Ardour4_Digital_Audio_Waveform.png alt=Waveform></figure><p>If we take a waveform and increase its amplitude a lot, some of the peaks
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may now fall outside the range that the computer can represent digitally.
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The computer’s inability to represent peaks outside the range of amplitude
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is called <em>clipping</em>, which results in a permanent loss of digital
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information, as well as a change in the sound quality which is recognizable
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as <em>distortion</em>. Ardour marks clipped peaks with the color red, as can be
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seen in the image below.</p><figure><img src=en/Ardour4_Digital_Audio_Clipping2.png alt=Clipping></figure><p>In the image above, one can also see the <em>mixer strip</em> on the far left,
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which gives a running measurement of the peaks, as well as an indication
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at the top of the <em>peak meters</em> showing the maximum peak so far. The red
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number indicates clipping has occurred.</p><div class="box notices tip"><div class=box-label><i class="fas fa-lightbulb fa-fw"></i> Tip</div><div class=box-content><p>Clipping often can happen at the time of recording if you set your
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microphone levels too high.</p></div></div><p>The range of decibels between the region’s maximum peak and the clipping
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point is commonly referred to as <em>headroom</em>, and common recording practice
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is to keep approximately 3 to 6 decibels of headroom between the maximum of
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your signal and the clipping point, with the clipping point itself being
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represented as 0 dB (zero decibels). In other words, an audio region with a
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comfortable amount of Headroom would have its maximum peaks between −6 dB
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and −3 dB.</p><p>Also, because the peaks of audio signals add together, care must be taken when
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<em>mixing</em> several sources together to keep the combined signals from clipping.</p><h2 id=sample-rate-and-bit-depth>Sample Rate and Bit Depth</h2><p>To make audio playable on a compact disc, for example, the computer must
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generate 44,100 samples per second. The sample rate determines the highest
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frequency which can be recorded or played back by the computer. A sampling
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rate of 44.1 kHz means that the highest frequency which can be represented is
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just under 22.05 kHz. Since normal human hearing lies within the range of
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approximately 20 Hz to 20 kHz, this is commonly accepted as a reasonable
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sample rate. Other commonly used sample rates include 48 kHz (e.g.
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multi-effects pedals) or 96 kHz (DVD audio).</p><p>Each sample is recorded as a 16-bit number. One <em>bit</em> is a piece of
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information which is either 0 or 1. If there are 16 bits together to make one
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sample, then there are 2^16 (65,536) possible values for each sample.</p><p>Thus, we can say that CD-quality audio has a sample rate of 44.1 kHz and
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a <em>bit depth</em> of 16 bits. Professional music recordings are usually mixed
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using 24 bits to preserve the highest amount of detail before being mixed down
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to 16 bits for CD. Older computer games have a distinctively rough sound,
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using only 8 bits. By increasing the sample rate, we are able to record higher
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sonic frequencies, and by increasing the bit depth, we are able to use a
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greater <em>dynamic range</em> (the difference between the quietest and the loudest
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sounds possible to record and play).</p><h2 id=continuing>Continuing</h2><p>In the next chapter, we’ll launch Ardour on Ubuntu Linux and learn the basics
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of the user interface.</p><p>Next: <a href=../../getting-started/starting-ardour/>STARTING ARDOUR</a>.</p><footer class=footline></footer></article></div></main></div><aside id=sidebar class=default-animation><div id=header-wrapper class=default-animation><div id=header class=default-animation><a id=logo href=/><svg id="Layer_1" width="92" height="80" viewBox="0 0 92 80" enable-background="new 0 0 92 80" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg"><defs id="defs6"/><path id="path6984" fill="#c61f40" d="M45.586.44-.082 79.558c3.356.0 2.828-2.382 4.417-2.382 1.681.004 1.367 1.19 2.951 1.19.814.0 1.467-.806 1.466-2.804.0-2.664.661-4.017 1.476-4.017s1.476 1.187 1.476 2.372c0 1.492.662 2.678 1.476 2.678.814.0 1.477-2.019 1.477-4.512l-.01-2.857c0-3.447.661-6.24 1.476-6.24s1.477 1.207 1.476 5.112c0 3.104.662 6.198 1.476 6.198s1.478-3.602 1.477-9.382c0-6.68.65-10.996 1.465-10.996s1.477 4.32 1.476 8.582c0 4.977.662 9.878 1.477 9.878s1.477-4.902 1.476-11.701c0-7.302.651-12.609 1.466-12.609.813.0 1.477 5.308 1.476 11.406.0 6.4.661 11.955 1.476 11.955s1.476-5.551 1.476-12.661c0-7.109.651-12.766 1.466-12.766s1.476 5.656 1.476 12.649c0 6.994.662 12.641 1.476 12.641s1.477-5.65 1.477-12.397c0-6.602.65-12.135 1.465-12.135s1.476 5.53 1.476 12.746c0 6.952.663 12.271 1.477 12.271.813.0 1.477-5.318 1.476-11.332.0-5.651.651-10.669 1.465-10.669s1.478 5.027 1.477 11.882c0 6.413.661 11.068 1.476 11.068s1.477-4.657 1.476-9.667c0-4.514.651-8.781 1.466-8.781s1.477 4.265 1.476 10.32c0 5.522.662 9.351 1.476 9.351s1.477-3.825 1.477-7.727c0-3.353.65-6.737 1.465-6.737s1.476 3.382 1.476 8.382c0 4.449.662 7.389 1.477 7.389s1.476-2.586 1.476-5.407c0-2.911.662-5.145 1.476-5.145s1.466 2.501 1.466 6.356c0 3.345.661 5.439 1.476 5.439s1.476-1.732 1.476-3.479c0-1.801.662-3.563 1.477-3.563.813.0 1.465 1.703 1.465 4.459.0 2.317.662 3.668 1.477 3.668s1.477-.941 1.477-2.034c0-1.438.661-2.098 1.476-2.098s1.466.987 1.466 2.814c0 1.44.661 2.192 1.476 2.192 1.539.0 1.331-1.917 2.951-1.929 1.773.0 1.253 2.571 2.941 2.571 1.217.0 2.159-.469 2.952-.474 1.316.0 1.408.928 4.416.928L45.588.44H45.586z" style="fill:#000"/></svg></a></div><div class="searchbox default-animation"><label for=search-by><i class="fas fa-search"></i></label>
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<script src=/ardour-tutorial/js/search.js?1652723066></script></div><div id=homelinks class=default-animation><ul><li><a class=padding href=/ardour-tutorial/en/><i class="fas fa-home"></i> Home</a></li></ul></div><div id=content-wrapper class=highlightable><ul class=topics><li data-nav-id=/ardour-tutorial/en/introduction/ title=Introduction class="dd-item parent"><input type=checkbox id=section-9278c07c1c4f7473c66529d5a0c6e688 class=toggle checked><label for=section-9278c07c1c4f7473c66529d5a0c6e688></label><a href=/ardour-tutorial/en/introduction/><b>1. </b>Introduction</a><ul><li data-nav-id=/ardour-tutorial/en/introduction/conventions/ title=Conventions class=dd-item><a href=/ardour-tutorial/en/introduction/conventions/>Conventions</a></li><li data-nav-id=/ardour-tutorial/en/introduction/what-is-digital-audio/ title="What is digital audio?" class="dd-item active"><a href=/ardour-tutorial/en/introduction/what-is-digital-audio/>What is digital audio?</a></li></ul></li><li data-nav-id=/ardour-tutorial/en/getting-started/ title="Getting started" class=dd-item><input type=checkbox id=section-6ba418844f4e8ce868bfa62d1bf5b9b1 class=toggle><label for=section-6ba418844f4e8ce868bfa62d1bf5b9b1></label><a href=/ardour-tutorial/en/getting-started/><b>2. </b>Getting started</a><ul><li data-nav-id=/ardour-tutorial/en/getting-started/starting-ardour/ title="Starting Ardour" class=dd-item><a href=/ardour-tutorial/en/getting-started/starting-ardour/>Starting Ardour</a></li><li data-nav-id=/ardour-tutorial/en/getting-started/overview-of-the-interface/ title="Overview of the Interface" class="dd-item alwaysopen"><input type=checkbox id=section-65fa48091b8ede8e5c409cc42ad6af14 class=toggle checked><label for=section-65fa48091b8ede8e5c409cc42ad6af14></label><a href=/ardour-tutorial/en/getting-started/overview-of-the-interface/>Overview of the Interface</a><ul><li data-nav-id=/ardour-tutorial/en/getting-started/overview-of-the-interface/editor-window/ title="Editor window" class=dd-item><a href=/ardour-tutorial/en/getting-started/overview-of-the-interface/editor-window/>Editor window</a></li><li data-nav-id=/ardour-tutorial/en/getting-started/overview-of-the-interface/mixer-window/ title="Mixer window" class=dd-item><a href=/ardour-tutorial/en/getting-started/overview-of-the-interface/mixer-window/>Mixer window</a></li><li data-nav-id=/ardour-tutorial/en/getting-started/overview-of-the-interface/recorder-window/ title="Recorder window" class=dd-item><a href=/ardour-tutorial/en/getting-started/overview-of-the-interface/recorder-window/>Recorder window</a></li><li data-nav-id=/ardour-tutorial/en/getting-started/overview-of-the-interface/cue-window/ title="Cue window" class=dd-item><a href=/ardour-tutorial/en/getting-started/overview-of-the-interface/cue-window/>Cue window</a></li></ul></li><li data-nav-id=/ardour-tutorial/en/getting-started/creating-tracks-and-busses/ title="Creating tracks and busses" class=dd-item><a href=/ardour-tutorial/en/getting-started/creating-tracks-and-busses/>Creating tracks and busses</a></li><li data-nav-id=/ardour-tutorial/en/getting-started/importing-audio/ title="Importing audio" class=dd-item><a href=/ardour-tutorial/en/getting-started/importing-audio/>Importing audio</a></li><li data-nav-id=/ardour-tutorial/en/getting-started/setting-up-the-timeline/ title="Setting up the timeline" class=dd-item><a href=/ardour-tutorial/en/getting-started/setting-up-the-timeline/>Setting up the timeline</a></li></ul></li><li data-nav-id=/ardour-tutorial/en/recording-audio/ title=Recording class=dd-item><input type=checkbox id=section-f34c0a5099ecaf52ba2ddf859ecf8564 class=toggle><label for=section-f34c0a5099ecaf52ba2ddf859ecf8564></label><a href=/ardour-tutorial/en/recording-audio/><b>3. </b>Recording</a><ul><li data-nav-id=/ardour-tutorial/en/recording-audio/recording-audio/ title="Recording audio" class=dd-item><a href=/ardour-tutorial/en/recording-audio/recording-audio/>Recording audio</a></li><li data-nav-id=/ardour-tutorial/en/recording-audio/understanding-routing/ title="Understanding routing" class=dd-item><a href=/ardour-tutorial/en/recording-audio/understanding-routing/>Understanding routing</a></li><li data-nav-id=/ardour-tutorial/en/recording-audio/routing-between-applications/ title="Routing between applications" class=dd-item><a href=/ardour-tutorial/en/recording-audio/routing-between-applications/>Routing between applications</a></li></ul></li><li data-nav-id=/ardour-tutorial/en/editing-sessions/ title="Editing sessions" class=dd-item><input type=checkbox id=section-ed31f397ca2ca87485e243bb5343239e class=toggle><label for=section-ed31f397ca2ca87485e243bb5343239e></label><a href=/ardour-tutorial/en/editing-sessions/><b>4. </b>Editing sessions</a><ul><li data-nav-id=/ardour-tutorial/en/editing-sessions/non-destructive-editing/ title="Non-destructive editing" class=dd-item><a href=/ardour-tutorial/en/editing-sessions/non-destructive-editing/>Non-destructive editing</a></li><li data-nav-id=/ardour-tutorial/en/editing-sessions/arranging-tracks/ title="Arranging tracks" class=dd-item><a href=/ardour-tutorial/en/editing-sessions/arranging-tracks/>Arranging tracks</a></li><li data-nav-id=/ardour-tutorial/en/editing-sessions/setting-up-time-signature/ title="Setting up time signature" class=dd-item><a href=/ardour-tutorial/en/editing-sessions/setting-up-time-signature/>Setting up time signature</a></li><li data-nav-id=/ardour-tutorial/en/editing-sessions/using-ranges/ title="Using ranges" class=dd-item><a href=/ardour-tutorial/en/editing-sessions/using-ranges/>Using ranges</a></li><li data-nav-id=/ardour-tutorial/en/editing-sessions/working-with-regions/ title="Working with regions" class=dd-item><a href=/ardour-tutorial/en/editing-sessions/working-with-regions/>Working with regions</a></li><li data-nav-id=/ardour-tutorial/en/editing-sessions/further-region-operations/ title="Further region operations" class=dd-item><a href=/ardour-tutorial/en/editing-sessions/further-region-operations/>Further region operations</a></li><li data-nav-id=/ardour-tutorial/en/editing-sessions/changing-edit-modes/ title="Changing edit modes" class=dd-item><a href=/ardour-tutorial/en/editing-sessions/changing-edit-modes/>Changing edit modes</a></li><li data-nav-id=/ardour-tutorial/en/editing-sessions/creating-looped-sections/ title="Creating looped sections" class=dd-item><a href=/ardour-tutorial/en/editing-sessions/creating-looped-sections/>Creating looped sections</a></li><li data-nav-id=/ardour-tutorial/en/editing-sessions/stretching-shrinking-regions/ title="Stretching & shrinking regions" class=dd-item><a href=/ardour-tutorial/en/editing-sessions/stretching-shrinking-regions/>Stretching & shrinking regions</a></li></ul></li><li data-nav-id=/ardour-tutorial/en/mixing-sessions/ title="Mixing sessions" class=dd-item><input type=checkbox id=section-f5608541dea6efa7d91368337a358262 class=toggle><label for=section-f5608541dea6efa7d91368337a358262></label><a href=/ardour-tutorial/en/mixing-sessions/><b>5. </b>Mixing sessions</a><ul><li data-nav-id=/ardour-tutorial/en/mixing-sessions/the-mixer-strip/ title="The mixer strip" class=dd-item><a href=/ardour-tutorial/en/mixing-sessions/the-mixer-strip/>The mixer strip</a></li><li data-nav-id=/ardour-tutorial/en/mixing-sessions/mixing-levels/ title="Mixing levels" class=dd-item><a href=/ardour-tutorial/en/mixing-sessions/mixing-levels/>Mixing levels</a></li><li data-nav-id=/ardour-tutorial/en/mixing-sessions/panning/ title=Panning class=dd-item><a href=/ardour-tutorial/en/mixing-sessions/panning/>Panning</a></li><li data-nav-id=/ardour-tutorial/en/mixing-sessions/using-plugins/ title="Using plugins" class=dd-item><a href=/ardour-tutorial/en/mixing-sessions/using-plugins/>Using plugins</a></li><li data-nav-id=/ardour-tutorial/en/mixing-sessions/using-sends/ title="Using sends" class=dd-item><a href=/ardour-tutorial/en/mixing-sessions/using-sends/>Using sends</a></li><li data-nav-id=/ardour-tutorial/en/mixing-sessions/dynamics/ title=Dynamics class=dd-item><a href=/ardour-tutorial/en/mixing-sessions/dynamics/>Dynamics</a></li><li data-nav-id=/ardour-tutorial/en/mixing-sessions/equalizing/ title=Equalizing class=dd-item><a href=/ardour-tutorial/en/mixing-sessions/equalizing/>Equalizing</a></li><li data-nav-id=/ardour-tutorial/en/mixing-sessions/using-automation/ title="Using automation" class=dd-item><a href=/ardour-tutorial/en/mixing-sessions/using-automation/>Using automation</a></li></ul></li><li data-nav-id=/ardour-tutorial/en/exporting-sessions/ title="Exporting sessions" class=dd-item><input type=checkbox id=section-c6dda4aa466f7b17965f60dcf070743f class=toggle><label for=section-c6dda4aa466f7b17965f60dcf070743f></label><a href=/ardour-tutorial/en/exporting-sessions/><b>6. </b>Exporting sessions</a><ul><li data-nav-id=/ardour-tutorial/en/exporting-sessions/exporting-a-session/ title="Exporting a session" class=dd-item><a href=/ardour-tutorial/en/exporting-sessions/exporting-a-session/>Exporting a session</a></li><li data-nav-id=/ardour-tutorial/en/exporting-sessions/exporting-a-region/ title="Exporting a region" class=dd-item><a href=/ardour-tutorial/en/exporting-sessions/exporting-a-region/>Exporting a region</a></li><li data-nav-id=/ardour-tutorial/en/exporting-sessions/exporting-a-range/ title="Exporting a range" class=dd-item><a href=/ardour-tutorial/en/exporting-sessions/exporting-a-range/>Exporting a range</a></li></ul></li><li data-nav-id=/ardour-tutorial/en/saving-sessions/ title="Saving sessions" class=dd-item><input type=checkbox id=section-46ec353b4160a03c88cfa742af14194f class=toggle><label for=section-46ec353b4160a03c88cfa742af14194f></label><a href=/ardour-tutorial/en/saving-sessions/><b>7. </b>Saving sessions</a><ul><li data-nav-id=/ardour-tutorial/en/saving-sessions/saving-a-session/ title="Saving a session" class=dd-item><a href=/ardour-tutorial/en/saving-sessions/saving-a-session/>Saving a session</a></li><li data-nav-id=/ardour-tutorial/en/saving-sessions/saving-a-snapshot/ title="Saving a snapshot" class=dd-item><a href=/ardour-tutorial/en/saving-sessions/saving-a-snapshot/>Saving a snapshot</a></li><li data-nav-id=/ardour-tutorial/en/saving-sessions/saving-a-template/ title="Saving a template" class=dd-item><a href=/ardour-tutorial/en/saving-sessions/saving-a-template/>Saving a template</a></li></ul></li><li data-nav-id=/ardour-tutorial/en/appendices/ title=Appendices class=dd-item><input type=checkbox id=section-6750f124334d31e698d6ee9da14e5d03 class=toggle><label for=section-6750f124334d31e698d6ee9da14e5d03></label><a href=/ardour-tutorial/en/appendices/><b>8. </b>Appendices</a><ul><li data-nav-id=/ardour-tutorial/en/appendices/further-help/ title="Further help" class=dd-item><a href=/ardour-tutorial/en/appendices/further-help/>Further help</a></li><li data-nav-id=/ardour-tutorial/en/appendices/glossary/ title=Glossary class=dd-item><a href=/ardour-tutorial/en/appendices/glossary/>Glossary</a></li><li data-nav-id=/ardour-tutorial/en/appendices/credits/ title=Credits class=dd-item><a href=/ardour-tutorial/en/appendices/credits/>Credits</a></li><li data-nav-id=/ardour-tutorial/en/appendices/license/ title=License class=dd-item><a href=/ardour-tutorial/en/appendices/license/>License</a></li><li data-nav-id=/ardour-tutorial/en/appendices/how-to-contribute/ title="How to contribute" class=dd-item><a href=/ardour-tutorial/en/appendices/how-to-contribute/>How to contribute</a></li></ul></li></ul><div id=shortcuts><div class=nav-title>More</div><ul><li><a class=padding href=https://github.com/prokoudine/ardour-tutorial><i class="fab fa-fw fa-github"></i> This tutorial on GitHub</a></li><li><a class=padding href=https://ardour.org/><i class="fas fa-fw fa-home"></i> 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