Wiard
Model GR-371 Woggle Bug
© 1996-2003 Wiard Synthesizer Company – design by Bill Sequeira/Axon Hillock
Source of Uncertainty
Wiard GR-371 Woggle Bug
Rev: 031001
LEDs
LR (LFO Rate) Green, lit when LFO [out] is at 10v.
ST (Stepped Voltage) Red/orange, indicates voltage at STEPPED CV
[out].
SM (Smooth Voltage) Red/orange, indicates voltage at SMOOTH CV [out]
B (Bug Light) Yellow, indicates audio pulse rates at OUT1 [out] and OUT2
[out]
LFO Control
LFO RATE [knob] Value added to voltage at RATE
[in], controls LFO rate linearly (1 cycle / 20 sec to
50 cycles / sec). Sets rate of change of SMOOTH
out tone and CV.
Oscillator Range
SMOOTH RANGE [knob] Sets the range of
SMOOTH TONE out (1-6 octaves).
Woggle Control
WOGGLE RANGE [knob] Sets the range of
WOOGLED TONE [out] (1-6 octaves).
WOGGLE TIME [knob] Sets the lock in time of the
woggle oscillator phase locked loop. The B lamp is
off when the woggle PLL is in lock.
Step and Tone Range Setting
CLUSTERING [knob] Sets the range of probable
values for the STEP CV [out]. At minimum, equal
probability of voltage from 0 – 10 V at STEP CV
[out]. At maximum, limits change to next value -
samples tend to cluster.
Main Output Section
OUT1, OUT2 [out] Primary audio outs for the
Woggle Bugs. Audio is output when B LED is lit.
LFO Section
RATE [in] 0-10v added to LFO RATE to vary LFO
rate from 0.05-50 Hz.
LFO [out] 0-10v square wave from 0.05-50 Hz.
Stepped Output
STEP CV [out] 0 – 10V stepped random voltage. A
new voltage is selected at each positive going clock
pulse at STEP CLOCK [in].
STEP CLOCK [in] New voltage selected each time a
positive clock pulse crosses 1.5V. Normalized to LFO
[out].
Smooth Output
SMOOTH CV [out] 0-8v smooth random voltage.
Probable rate of change set by LFO RATE knob
added with RATE [in].
SMOOTH TONE [out] 0-10v audio rate square
wave, the frequency range of which is set by the
SMOOTH RANGE knob.
Woggled Output
WOGGLED CV [out] 0 – 8V product of the smooth
and stepped random voltages. The demodulated
output of a phase locked loop frequency modulation
detector tracking the smooth tone and being
disturbed by the step control voltage. PLL loop lock-
in time is set by WOGGLE TIME knob. When the PLL
is in lock, the B LED is off.
WOGGLED TONE [out] 0 – 10V audio rate square
wave, the frequency range of which is set by the
WOGGLE RANGE knob.
Woggle PLL/VCO Disturb CV Inputs
DISTURB CV 1, DISTURB CV 2 [in] 0-10v control
voltage added to STEP CV out at the WOGGLE TONE
in. WOGGLE RANGE knob must be set to less than
maximum for this input to work, 1 goes to left
Woggle Bug and 2 goes to right.
Child Tone Outputs
Child tones are the XOR (ring mod) product of the two Woggle Bug parents.
CHILD TONES 3 [out] – 0 – 10V pulse wave which is the audio XOR product of the SMOOTH TONE
[out] of each Woggle Bug. Sound changed by both SMOOTH TONE controls.
CHILD TONES 4 [out] – 0 – 10V pulse wave which is the audio rate XOR product of the WOGGLE
TONE [outs] of each Woggle Bug. Sound affected by all 10 knobs.
Generator
Processor
Audio
Control
Voltage
Out1, Out2
Smooth Tone
Woggle Tone
Child Tones
None
Step CV
Smooth CV
Woggled CV
LFO (SQR)
None
Woggle
Bug
Two circuits - WOG1, WOG2
