Operation Manual

6.86 Sync Ping Pong Delay 144
very low frequencies used as control signals rather than audio ones. It has two inputs and three
outputs. The first input is the sync input signal which is used to sync the module to an external
source. The second input resets the waveform at the beginning of its cycle each time a signal above
0.1 Volt is received. The first two outputs are the same as the first two inputs and are used to control
other Sync LFO or Sequencers. The third output is the waveform signal delivered by the module.
The module can generate four waveforms: sine, sawtooth, square and ran-
dom. The waveform is selected with the four position switch on the front panel.
The width of the waveform can be adjusted with the pw knob. The polarity
knob inverses the phase of the waveform. The reset knob enables one to man-
ually resets the waveform at the beginning of its cycle each time it is pressed.
The ext/int switch selects if the sync signal comes from another source (ext) or
the internal clock of the module (int). The green tempo display is used to set
the tempo of the module, to adjust it, click-hold on it and drag up or down. The
step control is used to multiply or divide the sync signal by the number of steps
indicated in the display. When the ext/int switch is set to ext the internal tempo
controls have no effect.
Typical Use
Two Sync LFO can be linked to create double synced modulation source for other modules.
6.86 Sync Ping Pong Delay
The Sync Ping Pong Delay is a module which generates echoes
that can be panned in order to regularly alternate between the left
and the right channel. This module has three inputs and two out-
puts. The first input is a sync signal from a Master Sync Input,
Sync LFO or a Sequencer module. The second and third inputs
are source signals sent into the left and right channel while the two
outputs of the module are the left and right channel output signal
respectively.
The algorithm implemented in this module is presented in Fig-
ure 87. It is based on two delay lines each including a low-pass filter. The signal at the end of each
delay line is fed back into the input of the other line with an attenuation coefficient. This algorithm
results in a signal traveling from one channel to the other, each time attenuated and filtered in the
high frequencies due to the gain factor and the presence of the low-pass filter.
Tuning the delay
The time knob sets the length of the delay line and therefore the time between echoes. When the
sync button is pressed, the sync signal from the first input of the module is used to determine the