Acoustica Mixcraft 7 - Manual (Page 321)

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MUSICAL TYPING KEYBOARD
(MTK)
If you do not have a MIDI keyboard attached to your computer, you can use your
computer's standard QWERTY keyboard to play notes.
OPENING THE MTK
Select View>Musical Typing, click the Musical Typing... button in the Instrument Preset
window, or use the keyboard shortcut CTRL+ALT+K.