Introduction

Manipulations and Displaying Options

Manipulations

Generalities

Annotations can be manipulated modified and managed almost like all surface filters, in the Sonogram window or via the Processing Sequencer. For detailed information, refer the corresponding sections.

The Expand... , Invert and Change Gain and Replicate commands do not apply to MIDI annotation.

Surface Filters Manipulation
Resize and Move

Annotations can be moved and resized like surface filters, with a few exceptions.

  • Use the Shift and ↑ or ↓ keys to move annotations vertically, semitone by semitone : this interval is not linear from the frequency point of view : this shortcut correponds to the algorithmic "midi-to-frequency" steps.

  • MIDI annotations necessarily cover a constant 100 cents – semitone– range. This heighth cannot be modified. If an annotation is moved along the frequency axis, its heighth is automatically updated – see below for more information about annotations height and sonogram scale.

Gain Modification and Parametric Values Edition
Play

As such, MIDI annotations cannot be played in AS. The result can be heard at the import in another application, such as a sequencer, a score editor, or programming tools handling MIDI files.

Sonogram Scale and Frequency Grid

The use of MIDI annotations may require a logarithmic sonogram scale and the display of a frequency grid. These parameters are controled from the Sonogram window and display and Grid Settings window.

Scale and Annotations Heighth

The MIDI scale corresponds to MIDI pitch standards. The linear representation of musical intervals implies a logarithmic display of frequencies in Hz, but it is not compulsary.

  • For a linear display of annotations, Ctrl click on the sonogram frequency scale and choose a logarithmic Hz (log) or KHz (log) scale.

  • The annotations heighth depends on the Sonogram window frequency scale : it will be constant with a logarithmic scale, or it will vary with a linear scale. To modify the relationship between the frequency and annotation heigth, choose the appropriate scale.

MIDI Notes Grid

The MIDI grid allows to visualize the steps between each semitone in the sonogram. It can also be used to set the magnetism of the window.

To display the MIDI notes grid : chooseWindows/Show Grid Settings

  • Check the Frequency grid option.

  • If necessary, modify the value of the Middle A Frequency prompt.

  • You can possibly hide the piano roll with the Piano roll option. Note that this option is not active if the Frequency grid is not displayed.

Frequency Grid and Magnetism
Piano Roll Option

The Piano Roll option allows to display keys on the left of the sonogram. It is selected by default. A logarithmic frequency scale seems more adapted, again, to this option.

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