User Guide

Chapter 12: Tutors, Wizards, and Practice Aids
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The Fine Tune Control currently does not change the pitch of playback (though that would be an excellent future
feature). Currently ACW's Fine Tune control only improves Chord Detection on mis-tuned songs.
The Fine Tune control is calibrated in cents, 1/100th of a semitone. Therefore, if a song is perfectly in the key of C,
but if you set Fine Tune to +100 Cents, ACW would display chords in the key of B. Similarly, if you set Fine Tune
to -100 Cents, it would display that song's chords in the key of C#.
That simple use of the Fine Tune control is just a backwards way to transpose the Chords. But if you set Fine-Tune
somewhere in the middle, ACW looks for notes that are somewhere “in the cracks” between the piano keys. For
instance, if your song SHOULD be in the key of C, but it was unfortunately recorded 50 Cents sharp--
There could be many reasons that a song was recorded off Concert Pitch. Maybe the recording studio had a broken
tape recorder. Perhaps the Piano Tuner was smoking Crack, or the singer couldn't quite hit the highest note. Maybe
the vinyl record cutter was off-speed, or some Record Executive decided that the song was 10 seconds too long for
airplay, and instructed the Mastering Engineer to speed it up a little bit. In such cases ACW can get confused, mis-
identifying some pitches too high and other pitches too low, detecting nonsense Chords.
So if your favorite song was unfortunately recorded 50 Cents sharp, you can set the Fine-Tune control to +50 Cents
so that ACW will properly display in the 'original' key.
Auto Estimate Tuning
ACW can automatically estimate the tuning, which helps in some cases. Since the
estimation is math-intensive, ACW only analyzes one bar of music at a time.
Right-click somewhere inside a bar and pick the Estimate Tuning function.
After the process is finished, up pops the results dialog.
As advised in the dialog, results can be improved by carefully picking the bar.
Bars with relatively long notes are easier to analyze, compared to bars containing
flashy fast melodies.
It can be useful to spot-check a few bars. If several spot-checks give similar
answers (within a few cents), you have good confidence that the results are
actually meaningful, not being randomly affected by out-of-tune melodies or loud
drums.
However, if the first estimate reads +43 and the next measurement reads -12, then
it probably means that your song is not a good candidate for automatic Tuning
Estimation.