Set the CUTOFF FREQUENCY to -2 and repeatedly depress and hold down
a key while setting the AMOUNT OF CONTOUR at various levels. The
more this control is turned up, the greater will the increase and
decrease in the brightness of each note. Controls (17) and (19) have
an additive effect on the cutoff frequency.
3 ) The ATTACK TIME control (20) determines the duration of the initial
segment of the filter contour. The initial rise of the filter
cutoff frequency can be as short as 10 milliseconds or as long as
10 seconds. (The frequency at which the contour begins is determined
by control (17), while the peak which it reaches is determined by
controls (17) and (19) combined.) Repeatedly depress a key while
varying the setting of the ATTACK TIME control from left to right.
You will hear the brightness of the note increase sharply at first,
and then more gradually as the attack time increases.
4. The DECAY TIME control (21) determines the duration of the second
segment of the contour, the fall from the initial peak to the sustain
level. The range of this control is about the same as that of the
previous control. Set the DECAY TIME control at various levels
moving slowly from left to right, while repeatedly depressing a key.
At first you will hear the brightness drop sharply after the initial
11
Fig. 6
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