Kurzweil HUB7, Manual, Page: 19 / 56

Using the Joystick
1-13
is the bottom-to-top position. In other words, X and Y basically
describe a point within a square. Because the joystick has a
circular base, however, the combinations of X and Y that are “in
the corners” are not generally available.
The other 2 parameters, Rad and Angle, also describe the position
of the joystick handle, but using polar geometry: the location of
the point in the circle is expressed as a distance from the center
and an angle.
Rad is short for radius, which indicates the distance of the handle
from the center of the circle. When the joystick is centered in its
ring, the radius is 0. As you move the joystick in any direction,
the value increases, until it reaches the outer ring, where Rad will
be at a maximum (127).
Angle , sometimes called theta , tells the angle of the handle. As
you move the joystick clockwise, the value of angle will increase;
when you move the joystick counterclockwise, the angle will
decrease. The value is greatest just before the 12 o’clock position,
where it jumps abruptly down to 0. When the Angle controller is
connected to the Angle parameter in a panner, there does not
appear to be an abrupt change, because of the circular behavior of
the panner (i.e., 0 degrees is the same as 360 degrees). The panner
wraps smoothly back around to center, even though the Angle
controller value jumps from 127 to 0.
You can play with the joystick while on the Remote:JOYSTIK
page to get a sense of how each value changes when you move
the handle. Following the outer ring with the handle allows you
careful control of the angle parameter, while the radius will be at
maximum. If you center the joystick in the ring, you can reduce
the radius to nearly zero, but controlling the angle parameter will
be more dif
fi cult.
The numeric value generated by the joystick will be the same
whether you are using the joystick for panning or MIDI. The
parameters that are being controlled inside the KSP8, however,
and how they are interpreted, will depend on the mode you have
selected. The following sections describe the three joystick
modes: Pan, MIDI, and Auto.