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Keyboard Tools is a multi-platform application for Piano, Keyboard and Mallet Percussion Players ( Vibraphone, Marimba, Xylophone,.. ) of any style.
It's a learning tool which helps you finding scales, chords, voicing, harmony and practicing.
It comes with a bunch of useful features and customization : from 2 to 5 octaves, different piano sounds, metronome, favorites tunes, circle of fifths, chords and scales, printing and copying the keyboard, ...
The keyboard can show notes, key numbers, can begin from midi note C0 to C4, or F1 to F5 and will respond to mouse click, midi events, handling velocity, ...
Several windows can be opened, for example, one showing a chord and another showing the relative scale.
The favorites tunes "Player" can play almost any video or sound files.
See the manual on http://www.rollonbuddy.com/KeyboardTools/KBManual/KBManual.html for more details.
All suggestions are welcome, especially if you want more scales or chords :
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Add a new entitlement for sound playing in Mountain Lion