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6.86 Sync Ping Pong Delay 145
Right Delay LineLowpass
Left Delay LineLowpass
Mix
Pan
Feedback
Left Input
Right Input
Left Ouput
Right Ouput
Figure 87: Ping Pong Delay algorithm.
length of the delay line which is adjusted to fit the number of steps appearing in the display, four
steps representing a quarter note. The feedback knob is used to adjust the amount of signal re-
injected from the end of one line into the input of the other one. The cutoff knob controls the cutoff
frequency of the low-pass filter applied to the signal in the feedback loop and is used to reduce
the brightness of each echo. The pan knob is used to balance the input signals between the left
and right channels. In its leftmost position, signal will only be fed into the left delay line and one
will hear clearly defined echo first from the left channel and then from the right channel and so
on. In its rightmost position, the behavior will be similar but with the first echo coming from the
right channel. These two extreme position correspond to the standard ping pong effect but a a less
extreme behavior can be obtained by choosing an intermediate position. Finally, the mix knob is
used to control the amount of “dry” and “wet” signal in the output signal. In its leftmost position
only dry signal is sent to the output while when fully turned to the right, only wet signal is heard.
Typical Use
In Figure 88, a Sync Ping Pong Delay module is used to add a space effect to a mono signal.
Figure 88: Creating a stereo delay effect with mono signal.
Note: A Sync Ping Pong Delay is included in the output stage effect stage as explained in Sec-
tion 4.8. See also Delay and Sync Delay.
145


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