ADA 64i-1.28i-2.56i owners manual
3.7 MODULATION
The MODULATION DEPTH control allows you to fade between the static setting of the DELAY
MULTIPLIER control and the sweeping voltage of the internal low frequency oscillator. When the
DEPTH control is set at "0", the delayed signal is not swept and the delay time remains
stationary.
As the DEPTH control is turned clockwise, a wider range of the selected time delay is swept. With the
DEPTH control set at " 1 0", the full 8: 1 range is swept and the MULTIPLIER control is disabled. At
settings less than "10", the MULTIPLIER sets the center of the sweep range. The MODULATION
RATE LEDS give a visual indication of the sweep speed, the direction the sweep is moving (up or
down), and how close the sweep is to its upper or lower limits. The RATE LEDS increase in brightness
as they reach their upper or lower limits, giving a visual indication of the point where your effect is
starting to "turn around."
The MODULATION WAVEFORM control continuously blends the shape of the modulation function
from a triangle to a sine to a square wave. Full counterclockwise position of the knob selects a triangle
wave for delay times that reach a peak or dip and quickly turnaround — especially useful for flanging
effects. Advancing the knob towards the 12 o'clock position selects pure sine wave modulation for
delay times that smoothly increase and decrease at a speed corresponding to the RATE control,
useful for chorusing and vibrato effects. Full clockwise position selects a square wave for delay times
that jump up, then down, for stepped pitch-shifting effects. The MODULATION SPEED control adjusts
the low frequency oscillator from (Msec to 25sec. Extremely slow sweeps are useful for chorusing,
flanging and subtle effects. Faster sweeps can produce vibrato, fast flanging and rotating speaker
simulation.
4.0 PATCH DIAGRAMS
IMPORTANT NOTICE:
.64i OWNERS SHOULD USE DIAGRAMS OF 2.561 TO SET FRONT PANEL CONTROLS,
AS THE FIRST FIVE DELAY PUSHBUTTONS ON THE 2.561 ARE IDENTICAL TO THE
THOSE ON THE .64
FIGURE 4-1 / CLASSIC FLANGE
This demonstrates the full 8:1 sweep range of your digital delay. Turning the REGENERATION LEVEL
control clockwise produces more resonant or more dramatic flanging effects.
FIGURE 4-2 / EVEN/ODD HARMONIC
At minimum MULTIPLIER control settings, switch between in-phase and out-of-phase settings with the
PHASE switch. Inverted signals will cancel lower-frequencies thereby apparently emphasizing treble
content.
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