More passive form

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Ed Ward 2017-11-15 15:34:10 +01:00
parent addc8c3758
commit dbdbfb9af9
5 changed files with 142 additions and 80 deletions

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<p>Adding pitch bending or aftertouch can add a lot of subtlety to an otherwise plain sounding midi region and help humanize it.</p>
<p>
Adding pitch bending or aftertouch can add a lot of subtlety to an otherwise
plain sounding midi region and help humanize it.
</p>
<img src="/images/MIDI_pitch_bending.png" alt="Automation: pitch bending" />
<figure>
<img src="/images/MIDI_pitch_bending.png" alt="Automation: pitch bending">
<figcaption>Automation: pitch bending</figcaption>
</figure>
<p>Pitch bending and aftertouch both work the same way, through automation. Right click the MIDI track's header &gt; Automation &gt; Bender <em>(or Pressure)</em> &gt; <em>choose the channel you want to bend</em>.</p>
<p>
Pitch bending and aftertouch both work the same way, through automation, by <kbd class="mouse">right</kbd>
clicking the MIDI track's header <kbd class="menu">&gt; Automation &gt; Bender (or
Pressure) &gt; the channel to bend</kbd>.
</p>
<p>Using the Draw tool, as for all the automation, allows to create a gradual change from one drawn point to another. A line in the center produces no change to the pitch, while a line above the center will bend the pitch to a higher note (up to 4 semitones) and a line going under the middle will bend the pitch to a lower note.</p>
<p>
Using the Draw tool, as for all the automation, allows to create a gradual
change from one drawn point to another. A line in the center produces no
change to the pitch, while a line above the center will bend the pitch to a
higher note (up to 4 semitones) and a line going under the middle will bend
the pitch to a lower note.
</p>
<p>The values can be anything between 0 (-4 semitones) to 16383 (+4 semitones). No automation or a value of 8192 means no pitch shifting.</p>
<p>Aftertouch works very similarly, though the values are between 0 and 127. It should be noted that aftertouch differs from velocity, as aftertouch allows to slightly change the timbre or create a vibrato, while the velocity sets the power with which the note is played (e.g. on a keyboard, the key is hit).</p>
<p>
The values can be anything between 0 (-4 semitones) to 16383 (+4 semitones). No
automation or a value of 8192 means no pitch shifting.
</p>
<p>
Aftertouch works very similarly, though the values are between 0 and 127. It
should be noted that aftertouch differs from velocity, as aftertouch allows to
slightly change the timbre or create a vibrato, while the velocity sets the
power with which the note is played (e.g. on a keyboard, the key is hit).
</p>

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<h2>Making an existing copy of a MIDI region independent</h2>
<p>
Context-click on the MIDI region you want to be
independent. From the context menu, select <kbd class="menu">MIDI &gt; Unlink From
Other Copies</kbd>. The copy is now using an independent version of
the data, and edits to the copy will affect only the copy. Other
copies will continue to share data.
<kbd class="mouse">Right</kbd> clicking on the MIDI region to be independent
then selecting <kbd class="menu">MIDI &gt; Unlink From Other Copies</kbd>
makes it independant: the copy is now using its own version of the data, and
edits to the copy will affect only the copy. Other copies will continue to
share data.
</p>
<p class="note">
@ -43,7 +43,6 @@
the copy is made. If the region was already trimmed and then a copy
is made, an independent copy will have no access to data that is
earlier or later than the bounds of the region it was copied
from. Put differently, if you make an independent copy of a trimmed
MIDI region, you cannot "untrim" it to a larger size.
from. Put differently, making an independent copy of a trimmed
MIDI region only retains the visible part of it.
</p>

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<p>
Ardour is capable of being used to both record and deliver MIDI
"scene" automation. These are MIDI messages typically used to switch
presets or "scenes" on a variety of external equipment (or
software), including lighting and other audio/video tools. A common
use case is to automatically change presets between songs or to change
lighting conditions based on a specific position on the timeline.
Ardour is capable of being used to both record and deliver MIDI "scene"
automation. These are MIDI messages typically used to switch presets or
"scenes" on a variety of external equipment (or software), including lighting
and other audio/video tools. A common use case is to automatically change
presets between songs or to change lighting conditions based on a specific
position on the timeline.
</p>
<p>
Each change from one scene to another is represented by a marker in
the "Marker" bar.
Each change from one scene to another is represented by a marker in
the "Marker" bar.
</p>
<p>
Technically, scene changes are delivered as a combination of bank and
program change MIDI messages. MIDI allows for 16384 banks, each with
128 programs.
Technically, scene changes are delivered as a combination of bank and
program change MIDI messages. MIDI allows for 16384 banks, each with
128 programs.
</p>
<h2>Recording Scene Changes</h2>
<p>
Ardour has a dedicated MIDI port named "Scene In". Connect this port
to whatever source(s) of MIDI scene (bank/program change) messages you
wish to record.
Ardour has a dedicated MIDI port named "Scene In". Recording scene changes can
be done by connecting this port to whatever source(s) of MIDI scene (bank/program
change) messages should be recorded.
</p>
<p>
Whenever the global record enable button is engaged and Ardour's
transport is rolling, a new marker will be created for each scene
change message received via the "Scene In" port.
Whenever the global record enable button is engaged and Ardour's
transport is rolling, a new marker will be created for each scene
change message received via the "Scene In" port.
</p>
<p>
If 2 different scene changes are received within a certain time
period, only the later one will be recorded as a new marker. The
default threshold for this is 1 millisecond.
If two different scene changes are received within a certain time
period, only the later one will be recorded as a new marker. The
default threshold for this is 1 millisecond.
</p>
<p>
If a scene change message is received while the playhead is close to
an existing marker with an associated scene change, the recording
process will alter the scene change in the existing marker rather than
adding a new one. The default threshold for this "proximity" test is 1
millisecond.
If a scene change message is received while the playhead is close to
an existing marker with an associated scene change, the recording
process will alter the scene change in the existing marker rather than
adding a new one. The default threshold for this "proximity" test is 1
millisecond.
</p>
<h2>Manually Creating Scene Changes</h2>
<p>
This feature is not currently implemented.
This feature is not currently implemented.
</p>
<h2>Playing back Scene Changes</h2>
<p>
Ardour has a dedicated MIDI port named "Scene Out". Connect this port
to wherever you wish to send MIDI scene (bank/program change) messages.
Ardour has a dedicated MIDI port named "Scene Out". Playing back scene
changes can be done by connecting this port to whatever target(s) of MIDI
scene (bank/program change) messages should be sent to.
</p>
<p>
When the global record enable button is
<em>not</em> enabled, the relevant message(s) will be sent via the
"Scene Out" port as the playhead rolls past each marker with a scene
change associated with it.
When the global record enable button is <em>not</em> enabled, the relevant
message(s) will be sent via the "Scene Out" port as the playhead rolls past
each marker with a scene change associated with it.
</p>
<h2>Editing Scene Changes</h2>
<p>
This feature is not currently implemented.
This feature is not currently implemented.
</p>
<h2>Disabling Scene Changes</h2>
<p>
This feature is not currently implemented.
This feature is not currently implemented.
</p>

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<h2>Inserting Patch Changes</h2>
<p>
Ensure that the
<a href="@@edit-point-control">edit point</a> is
located where you want the patch change to be (within an existing
MIDI region). Context click, and from the MIDI region's context menu,
select <kbd class="menu">MIDI &gt; Insert Patch Change</kbd>. A
dialog will appear allowing you to set the bank and program values.
To insert a patch change, the <a href="@@edit-point-control">edit point</a>
should be located where the patch change should be (within an existing MIDI
region). When <kbd class="mouse">right</kbd> clicking, and from the MIDI
region's context menu, selecting <kbd class="menu">MIDI &gt; Insert Patch
Change</kbd>, a dialog appears allowing to set the bank and program values.
</p>
<h2>Modifying Patch Changes</h2>
<p>
Context-clicking on a patch change will bring up the same dialog that
was used to create it, allowing you to modify the program and/or bank
was used to create it, allowing to modify the program and/or bank
numbers.
</p>
<p>
You can also use the mouse wheel: <kbd class="mouse">&uArr;</kbd>/<kbd
The mouse wheel can also be used: <kbd class="mouse">&uArr;</kbd>/<kbd
class="mouse">&dArr;</kbd> on the patch change will alter the program
number, <kbd class="mouse mod1">&uArr;</kbd>/<kbd
class="mouse mod1">&dArr;</kbd> will modify the bank number.
@ -41,15 +40,15 @@
<h2>Moving Patch Changes</h2>
<p>
Just <kbd class="mouse">Left</kbd>-drag on the patch change to move it
Just <kbd class="mouse">Left</kbd>-dragging the patch change moves it
around.
</p>
<h2>Removing Patch Changes</h2>
<p>
Put the mouse pointer into the rectangular area, and press <kbd>Del</kbd>
or use the delete mouse button operation. This will remove the patch change
(the operation can be undone).
Pressing <kbd>Del</kbd> with the mouse pointer into the rectangular area, or
using the <kbd class="menu">delete</kbd> mouse button operation will remove the
patch change (the operation can be undone).
</p>
<h2>Names for Patch Numbers: MIDNAM files</h2>
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<p class=fixme>
Add content
</p>

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<p>Considering the numerical nature of MIDI events, it can be tempting to apply mathematical transformations to our MIDI regions by using mathematical operations. Ardour makes it very easy and powerfull with the Transform tool.</p>
<p>
Considering the numerical nature of MIDI events, it can be tempting to apply
mathematical transformations to our MIDI regions by using mathematical
operations. Ardour makes it very easy and powerfull with the Transform tool.
</p>
<img src="/images/MIDI_transform.png" alt="MIDI transformation" />
<figure>
<img src="/images/MIDI_transform.png" alt="MIDI transformation">
<figcaption>MIDI transformation</figcaption>
</figure>
<p>To access the Transform tool, right click the MIDI region &gt; <em>name_of_the_region</em> &gt; MIDI &gt; Transform&hellip;</p>
<p>
Accessing the Transform tool is done by <kbd class="mouse">right</kbd> clicking
the MIDI region <kbd class="menu">&gt;<em>name_of_the_region</em> &gt; MIDI
&gt; Transform&hellip;</kbd>
</p>
<p>First, select the property you want to modify in the 'Set' field, then change the target value using the 2 following fields. If you want to add more operands, click the "+" sign to create new lines. You can remove a superfluous line using the "-" sign on the right of the newly created line.</p>
<p>
To act on a property, it must be selected in the <kbd
class="menu">Set</kbd> field, then the target value must be changed using the two
following fields. To add more operands the "+" sign should be clicked to
create new lines. These can be removed using the "-" sign on the
right of the newly created lines.
</p>
<p>In the picture above, we've used the Transform tool to add a bit of humanisation, by slightly changing the velocity of each note of the region, by a random number between -19 and +19 from it's original velocity. So we've used 3 operations:</p>
<p>
In the picture above, the Transform tool has been used to add a bit of
humanization, by slightly changing the velocity of each note of the region, by
a random number between -19 and +19 from it's original velocity. So
three operations are applied:
</p>
<ul>
<li>Set velocity to this note's velocity</li>
@ -15,40 +37,61 @@
<li>- a random number from 1 to 20</li>
</ul>
<p>Each note will trigger a calculation of its own, so its velocity will be increased by a random number between 1 and 20, then decreased by a random number between 1 and 20.</p>
<p>
Each note will trigger a calculation of its own, so its velocity will be
increased by a random number between 1 and 20, then decreased by a random
number between 1 and 20.
</p>
<p>The properties that can be computed are:</p>
<p>
The properties that can be computed are:
</p>
<ul>
<li>note number (eg C2 is note number 24, C#2 is 25 and so on)</li>
<li>note number (eg C2 is note number 24, C#2 is 25 and <a href="@@midi-notes-ref">so on</a>)</li>
<li>velocity (the global intensity of the note, between 0 and 127)</li>
<li>start time (in beats)</li>
<li>length (in beats)</li>
<li>channel</li>
</ul>
<p>and the calculation may be based on the following properties:</p>
<p>
and the calculation may be based on the following properties:
</p>
<ul>
<li>this note's</li>
<li>the previous note's</li>
<li>this note's index (number of the note, i.e. the first one is 0, the second is 1, etc.)</li>
<li>this note's index (number of the note, i.e. the first one is 0, the second
is 1, etc.)</li>
<li>exactly (for a constant value, between 1 and 127)</li>
<li>a random number from <em>lower</em> to <em>higher</em> (<em>lower</em> and <em>higher</em> beeing constant values between 1 and 127)</li>
<li>equal steps from <em>lower</em> to <em>higher</em> (<em>lower</em> and <em>higher</em> beeing constant values between 1 and 127)</li>
<li>a random number from <em>lower</em> to <em>higher</em> (<em>lower</em> and
<em>higher</em> beeing constant values between 1 and 127)</li>
<li>equal steps from <em>lower</em> to <em>higher</em> (<em>lower</em> and
<em>higher</em> beeing constant values between 1 and 127).</li>
</ul>
<p>The mathematical operators can be:</p>
<p>
The mathematical operators can be:
</p>
<ul>
<li>+ (addition)</li>
<li>- (substration)</li>
<li>* (multiplication)</li>
<li>/ (euclidian division)</li>
<li>mod (rest of the euclidian division)</li>
<li>mod (rest of the euclidian division).</li>
</ul>
<p>All this operations can be very handy, as long as you find a mathematical way to achieve your goal. Beware though of odd "border cases": division by zero (which does nothing), using the note's index and forgetting it starts at 0 and not 1, etc.<p>
<p>You can nevertheless create very interesting results, like humanizing (randomizing the velocity, start time and duration of all the notes), creating arpeggios, automating tedious tasks, transposing, etc.</p>
<p class="note">
All these operations can be very handy, as long as ther is a mathematical way
to achieve the targeted goal. Beware though of odd "border cases": division by
zero (which does nothing), using the note's index and forgetting it starts at
0 and not 1, etc.
<p>
<p>
Very interesting results can nevertheless be created, like humanizing
(randomizing the velocity, start time and duration of all the notes), creating
arpeggios, automating tedious tasks, transposing, etc.
</p>