Teac GVI - Manual (Page 58)

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PLAYZONES SECTION
The virtual Keyboard in the PLAYZONES section of the Stack Properties
dialog can be used as a MIDI trigger as well as being a visual reference for
the various keyboard ranges of each instrument on the stack. The currently
selected instrument layer appears yellow while other layers appear light
purple. Stack Keyswitches appear light blue.
The active (playable) keyboard range of each instrument can be modified
using the triangular brackets located in the lower half of each instrument
layers window. First select the instrument layer you wish to modify by
clicking in its window, and then move the upper and lower boundary
brackets to the desired range.
Note regions on the stack that are beyond the range of the currently
selected instrument layer will appear on the virtual keyboard with diagonal
blue stripes.