PG Music Band in a Box - 2010 (Macintosh) Guia do Utilizador descarregar pdf (Página 232)

Chapter 12: Wizards, Tutors, and Utilities

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The Audio Piano Roll is divided by a blue horizontal line. Notes below the blue line

have been identified as the bass part by the Audio Chord Wizard.

The note bars look like a MIDI Piano Roll, but they are not exactly the same as a MIDI

Piano Roll. Audio Chord wizard detects the strongest frequencies found in each eighth-

note time slot, and displays them in the Note Bars window.

Sometimes the displayed frequencies REALLY ARE instrument notes played in the

audio file. But they could be spurious information, such as the accidental loudest

frequency of a drum beat. A midrange frequency note-bar might be showing the sum of

harmonics from several instruments, each instrument's harmonics contributing to the

strength of that frequency.

The Notes Bars display information is real and useful, but try not to assume that every

displayed note-bar is a real note in the audio.

Opening Files

When the Audio Chord Wizard button is pressed, the program window will

open and then launch the Open Wave File dialog for selection of the audio

file to be analyzed. There is a file named Frontier.m4a in the /Band-in-a-

Box/Tutorials folder that you can use to try out the Audio Chord Wizard.

When you select a file to open you will see a series of Progress messages. The Audio

Chord Wizard is then launched, and more progress messages will flash on screen as the

file is analyzed and imported. As well as interpreting the chords, the program is also

inserting bar lines and setting the tempo.

Chord Detection

Chord Detection accuracy depends on the accuracy of the bar lines. If bar lines are not

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PG Music Band in a Box - 2010 (Macintosh) Guia do Utilizador Página 232