manual/include/clip-stretch-options.html
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<h2>Stretching</h2>
<p>
When you load an audio clip into a trigger slot, Ardour applies some
heuristics to estimate its tempo in beats per minute. Unless a metadata
in the file source provides information,
<a href="https://github.com/breakfastquay/minibpm">minibpm</a> is used
to analyze and detect the file's BPM.
</p>
<p>
After tempo is estimated, the clip is time-stretched to match the
session's tempo map. This means that should session's tempo change over
time (in either ramped or constant mode), all audio clips will be
re-stretched to accommodate for that.
</p>
<p>
Disabling stretching when original clip's tempo doesn't match that of the
session will most of the times make the clip audibly go out of sync with
the beat.
</p>
<h2>Stretch modes</h2>
<p>
Once stretching is enabled, there are several options how to apply it:
</p>
<ul>
<li><dfn>Crisp</dfn> works best for sounds with fast onset like drums and percussion</li>
<li><dfn>Smooth</dfn> is best used for sustained notes like pads</li>
<li><dfn>Mixed</dfn> is for anything in between</li>
</ul>
<h2>BPM</h2>
<p>
This is where the estimated tempo is displayed. It can also
be progressively divided or multiplied by two.
</p>
<p>
Supposing, session's tempo is currently 120bpm and original clip's tempo
is 90bpm. Stretching the clip to match session's tempo will make it sound
faster that it originally is.
</p>
<p>
If the estimated clip's tempo is divided by 2, stretching the resulted
45bpm back to 120bpm will make the clip sound faster. Vice versa,
multiplying the original clip's tempo by 2 and then stretching it down
from 180bpm to 120bpm will make the clip sound slower than it originally is.
</p>
<h2>Clip Length</h2>
<p>
This control allows adjusting the estimated tempo in a finer manner,
by changing the amount of beats it takes to play the clip in the selected
trigger slot. The change is immediately displayed in the BPM field above.
</p>
<h2>Length in Bars</h2>
<p>
This is an estimate of the clip's length as measured in bars for two
popular time signatures: 4/4 and 3/4.
</p>