41 lines
2.1 KiB
HTML
41 lines
2.1 KiB
HTML
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<p>
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Every MIDI note consists of two messages, a NoteOn and a NoteOff. Each one
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has a note number and a channel (also a velocity, but that isn't relevant
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here). The MIDI standard stresses that it is invalid to send a second NoteOn
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for the same note number on the same channel before a NoteOff for the first
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NoteOn. It is more or less impossible to do this with a physical MIDI
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controller such as a keyboard, but remarkably easy to trigger when editing
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in a DAW—simply overlapping two instances of the same note will do it.
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</p>
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<p>
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Ardour offers many options for how to deal with instances where you overlap
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two instances of the same note. Which one to use is a per-session property
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and can be modified from <kbd class="menu">Session > Properties > Misc > MIDI
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Options</kbd>.
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</p>
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<table class="dl">
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<tr><th>never allow them</th>
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<td>Edits that would create note overlaps are not allowed</td></tr>
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<tr><th>don't do anything in particular</th>
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<td>Ardour leaves overlapping notes alone—the behaviour of a MIDI receiver (plugin or hardware) is undefined</td></tr>
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<tr><th>replace any overlapped existing note</th>
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<td>When one note is moved to overlap another, remove the one that wasn't being moved</td></tr>
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<tr><th>shorten the overlapped existing note</th>
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<td>When one note is moved to overlap another, shorten the one that wasn't moved so that there is no overlap</td></tr>
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<tr><th>shorten the overlapping new note</th>
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<td>When one note is moved to overlap another, shorten the one that was moved so that there is no overlap</td></tr>
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<tr><th>replace both overlapping notes with a single note</th>
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<td>When one note is moved to overlap another, merge them both to form one (longer) note</td></tr>
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</table>
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<p>
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Changing the option in use will not retroactively make changes—it will
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only affect new note overlaps created while the option remains chosen.
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</p>
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<p class="warning">
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Ardour does not check for note overlaps across tracks or even across regions.
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If you create these, it is your responsibility to deal with the consequences.
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</p>
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