The bar lens (2) focuses the point of light as a line. The various light sources are activated separately by tone-selective switching so each light source strikes the lens at a different angle to re-focus the line at the level corresponding to the actually produced pitch of the note. Semitones e.g. C-sharp, D-sharp or F-sharp, are also portrayed in conventional musical systems as dotted lines arranged parallel in the system tone intervals. These lines can be differentiated in colour or pulsation by extending the vertical intervals of the notes to differentiate the increased number of lines per pitch to replace conventional sheet notation by motorised transport of the actual note lines over the dotted-line projection window.
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