AMPT User's Guide

A Filter is a MIDI Device that creates, alters, or responds to MIDI messages. It typically has both MIDI input and output. A Filter is used to create a specific musical effect.

This filter pans the audio to one side of the audio system or the other. This filter does not accept any input, so it may be placed only in the beginning of a chain of filters.

The Chord Filter creates a chord for every note that it receives. That is, for every note that the filter receives, it transmits all the notes to create the specified chord type and inversion.

Chord Types

Major

This chord playes the root, third, and fifth notes of a major scale, or a root note, the note 4 half-steps above the root, and the note 7 half-steps above the root.

Minor

This chord playes the root, third, and fifth notes of a minor scale, or a root note, the note 3 half-steps above the root, and the note 7 half-steps above the root.

Diminished

This chord takes a Minor chord, and lowers the fifth note by a half step, or it contains a root note, the note 3 half-steps above the root, and the note 6 half-steps above the root.

Augmented

This chord takes a Major chord, and raises the fifth note by a half step, or it contains a root note, the note 4 half-steps above the root, and the note 8 half-steps above the root.

Chord Inversions

Root Position

This leaves the notes in the natural order of notes in the chord, with the root at the lowest position

First Inversion

The first inversion of a chord takes the root of the chord, and moves it up an octave, leaving the third of the chord at the lowest position.

Second Inversion

The second inversion of a chord takes the root and third of a chord, and moves them up an octave, leaving the fifth of the chord at the lowest position.

The Echo Filter echoes the note played for the specified duration. The slider selects the number of times the note should be echoed. The interval selects how long the filter should wait before the note is echoed. The Decay selects the equation for determining the volume of each sequential note. The graph of each type of decay is displayed when the option is selected.

This keyboard displayes two octaves of keys. To play a note, either press on a key with the mouse, or use your computer keyboard to press the letter on the note you desire to play. You can use the slider to select the volume of the notes to play. You can also select the octave for the bottom notes of the keyboard. Lastly, you can select the channel to send the notes on.

This filter responds to NOTE ON and NOTE OFF messages by displaying the notes that are being played on a staff. The filter transmits all messages it receives to the devices it is connected with.

This keyboard displayes one octave of keys. To play a note, either press on a key with the mouse, or use your computer keyboard to press the letter on the note you desire to play. You can use the slider to select the volume of the notes to play. You can also select the octave for the notes of the keyboard. Lastly, you can select the channel to send the notes on.