time-warped reverberator
QUICK START GUIDE
SIGNAL FLOW AND FEATURES
STARLAB expands the sound of your Eurorack rig with lush reverbs as well as chorus, flanging, and modulated delays. STARLAB is also a full-featured KarplusStrong string synthesis voice module that allows freely alternating bowing and plucking as well as dynamic string damping. Complete with LFO with multiple
waveforms and targets, STARLAB is packed with powerful features and extensive CV I/O all while maintaining intuitive playability.
INPUT
DELAY
KARPLUS
HI
DAMP
REGEN DECAY
INPUT
SHIMMER
GLIMMER
INFINITE
FEATURES
• Three selectable reverb types for a wide variety of ambient textures
• DELAY/KARPLUS section with feedback
• Delay assignable to output for mod/verb and delay/verb effects
• Four-octave Karplus-Strong string synthesis mode with damping
control for string/verb full voice capability
• LFO section with various waveforms to modulate delay time, reverb size,
or tone filters
• FILTER section to sculpt the high and low EQ of the reverb and DELAY/
KARPLUS section
• HARMONICS section to enhance the aural spectrum of the reverb
• Adjustable SHIMMER for adding pitch shifting of up to +/- 1 octave to
the reverb
• GLIMMER for dynamic enhancement of harmonics
• Adjustable reverb core size to increase or decrease the space for
reflections, allowing for pitch control of the regenerating reverb content
DRY
ECHO ON
LOW
DAMP
WET
HI DAMP
REVERB
STRUCTURE
REGEN
SHIMMER
LOW PASS
FILTER
• Extensive CV control of parameters
• 4-pole 24dB/octave variable resonance low pass filter
• INFINITE freezes the input audio prior to the reverb tank
• Access to four presets from the front panel
• Independent WET and DRY level controls
• Analog dry path for a zero latency dry signal that is never converted to
digital
• Ultra low noise, high performance 24-bit 96kHz A/D and D/A converters
provide uncompromising audio quality
• Super high performance SHARC DSP
• 32-bit floating point processing
• Designed and built in the USA
OUTPUT
>> Download the complete manual at strymon.net/support/starlab <<
REVERB CONTROLS
ON
1 2
DRY
Sets the level of unprocessed input signal
sent to the output.
INPUT GAIN
Controls the gain of the input signal fed to the
reverb structure through a soft clipping input
stage. LED indicates signal level from GREEN
for clean reverb to RED for soft-clipping
distortion.
INFINITE
PRESS: Holds the current audio input to the
reverb while allowing new audio to continue
being processed by the reverb. Great for
generating ambient pads.
HOLD: Press and hold for 2 seconds to enter
PITCH QUANTIZE mode. SIZE/PITCH values
are restricted to the selected scale. Scales can
be selected via the SIZE/PITCH Quantize Scale
secondary function. See complete manual for
in-depth detail.
FAVORITE
Recalls the currently selected Favorite preset.
(See PRESET FUNCTIONS section for additional
information.)
Spillover: Enables effect
spillover between the
Favorite presets and the
manual setting of the
module by setting rear dip
switch 1 to ON.
SIZE / PITCH
Changes the process rate and size of the reverb
structure while maintaining the integrity of the reverb
audio. Turning clockwise increases the size and lowers
the pitch of any regenerating audio in the reverb
structure. Pitch ranges from -1 octave at minimum to
+1 octave at maximum. Size ranges from one-half size
at minimum to double the size at maximum.
TIP: You can “play” the SIZE/PITCH knob by
sending 1V/octave to the SIZE/PITCH CV.
TEXTURE
Selects one of three different reverb structures.
sparse: Granular-sounding reverb that can create interesting effects with staccato
inputs, or produce a clean reverb with sustained inputs.
dense: Plate-like reverb with a fast response and dense reflections that can venture
into ambient territory at high decay times.
diffuse: Slow-building, atmospheric wash that excels at ambient, swell, and even
reverse-like textures.
WET
Sets the overall reverberated signal level sent
to the output.
DECAY
Adjusts the amount of time for the reverb to
fade out. At higher DECAY settings, decay time
may be impacted by the FILTER settings.
DELAY AND HARMONICS CONTROLS
HARMONICS
SHIMMER: Adds pitch shifting to the reverberated signal. Effect is off when
SHIMMER knob is fully counterclockwise.
REGEN: Selects regenerative shimmer which applies the pitch shifting
within the reverb structure (REGEN LED GREEN) or input shimmer which
applies the pitch shifting at the input before the reverb structure (REGEN
LED off).
SHIMMER INTERVAL: Secondary function on the SHIMMER knob to select
the interval of the pitch shifting effect.
To select the SHIMMER INTERVAL: Turn the SHIMMER knob while holding
down the REGEN button.
Provides two octaves of total range from -1 octave at minimum to +1 octave
at maximum. Two additional interval options (-detune and +detune) are
available around the 12 o’clock position of the SHIMMER knob.
GLIMMER: Dynamically enhances aspects of the input signal’s harmonic
spectrum. Effect is off when GLIMMER knob is fully counterclockwise.
HIGH BAND: Selects between the high band (HIGH BAND LED GREEN) or
low band (HIGH BAND LED off) harmonics to be enhanced by the glimmer
effect.
DELAY/KARPLUS
FEEDBACK: Applies regeneration to the delay, resulting in more repeats with
longer delays, or more resonance with shorter delays. When in KarplusStrong mode, FEEDBACK affects string decay and structure resonance.
ECHO ON: Busses the delay output to the WET output to mix with the reverb
signal. For a ‘delay only’ experience, set DECAY to minimum.
DELAY/TUNE: In delay mode, applies pre-delay from 0 to 1.5 seconds max.
Control is log taper for finer resolution at lower DELAY/TUNE settings.
When TAP/TRIG clock CV input is detected, DELAY/TUNE knob acts as a clock
mult/div with the following ratios around the knob (min to max):
• 1/4, 1/3, 1/2, 2/3, 3/4, 1/1, 3/2, 5/3, 7/4, 2/1, 5/2
• Max delay time is 7.5s (3s clock input with 5/2 multiplier)
TAP: Allows the delay time to be set by tapping in a tempo.
See KARPLUS-STRONG CONTROLS for additional functions of the DELAY/
KARPLUS section.
NOTE: When the echo is off and the feedback is at minimum, the
DELAY/TUNE knob functions as a traditional pre-delay, adjusting the
time between the DRY signal and the onset of the reverb. Turning the
knob counterclockwise = shorter, clockwise = longer.
FILTER AND LFO CONTROLS
FILTER
LOW DAMP: Removes low end content both at the output and in the regenerating core portion of the reverb
as the knob is turned clockwise. In Karplus-Strong mode, removes low frequency content of the string.
HIGH DAMP: Removes high frequency content from the regenerating reverb structure as the knob is turned
clockwise. In Karplus-Strong mode, dampens the high end harmonics as the string decays.
LOW PASS: Changes the HIGH DAMP function to a 24dB/octave low pass filter applied at the output of the
reverb.
LOW PASS Resonance: To adjust the resonance (Q) of the low pass filter, press and hold the LOW PASS
button and turn the HIGH DAMP knob. Turning the knob clockwise increases the sharpness of the resonant
frequency resulting in a peaking response. Lower values create a gradual roll-off.
LFO
LFO TARGET: Selects the parameter that will be modified by the LFO.
delay: Modulates the delay time. Press the ECHO ON button for prominent delay mod effects. In Karplus-Strong mode, the tuning of the
string is modulated.
pitch: Modulates the SIZE/PITCH setting of the reverb.
filter: Modulates the filter cutoff frequency. Press the LOW PASS button for dramatic filter sweep. The effect is subtle when you are not in low
pass mode.
SPEED: Controls the period of the LFO waveform from 15 seconds to 1/15th second (15Hz).
When Envelope (env) is the selected waveform, SPEED controls the decay rate of the envelope.
When LFO CLK IN CV is detected, SPEED knob acts as a clock divider/multiplier with division by
8, 6, 5, 4, 3, and 2 on the first half of the knob range, and multiplication by 2, 3, 4, 5, 6, 8 on the
second half of the knob range. No change when set to the 12 o’clock position.
SHAPE: Selects from six different waveshapes for the LFO, including triangle, square, ramp,
saw, random, and envelope which responds to input dynamics with the input sensitivity set by
the DEPTH knob.
DEPTH: With the exception of the env shape, adjusts the amount of modulation. Modulation is off at the fully counterclockwise position. When env is selected,
modulation is off at 12 o’clock.
When Envelope (env) is the selected waveform:
• No modulation at 12 o’clock
• Turn counterclockwise for increasing negative envelope depth
• Turn clockwise for increasing positive envelope depth
When EXT LFO IN is detected:
• DEPTH knob acts as an attenuator and inverter of the incoming
signal (attenuverter)
• Minimum gain is at 12 o’clock
• Turn counterclockwise for increasing negative gain
• Turn clockwise for increasing positive gain
ADDITIONAL FUNCTIONS
PRESET FUNCTIONS
There are four onboard presets that are accessible using the FAVORITE button.
SWITCHING BETWEEN PRESETS: To switch between presets, press and hold FAVORITE,
then press one of the four center buttons. The currently selected preset will illuminate
RED while holding down the FAVORITE button.
SAVING A PRESET: Press and hold FAVORITE until the button flashes GREEN, then:
• Press FAVORITE to save to the current location
OR
• Press one of the four center buttons to save to another preset location
KARPLUS-STRONG CONTROLS
Karplus-Strong mode gives you access to a monophonic, delay-based string synthesizer. To enter Karplus-Strong
mode, hold the ECHO ON button and turn the DELAY/TUNE knob clockwise until the TAP/TRIG button turns RED. For
normal delay operation, hold the ECHO ON button and turn DELAY/TUNE knob counterclockwise until the TAP/TRIG
button blinks GREEN.
FEEDBACK: Affects string decay and structure resonance.
ECHO ON: Mixes in the dry string signal with the wet output. If ECHO ON is not selected, only the reverberated string
will be heard at the wet output.
DELAY/TUNE: Sets string tuning over a continuous 4 octave range. When SIZE/PITCH CV is detected, sets fine tuning
of 12 semitones.
TAP/TRIG (quick press): Triggers or ‘plucks’ string.
TAP/TRIG (hold): Continuously excites or ‘bows’ the string.
FEEDBACK CV: Affects string decay and structure resonance. FEEDBACK knob position acts as an offset.
SIZE/PITCH CV: Controls the string pitch interval at 1V/octave over a 4 octave range. Input range is 0-4V.
TAP/TRIG CV: Triggers or ‘plucks’ the string.
IN GATE CV: Continuously excites or ‘bows’ the string in latching or momentary operation. See complete manual for
in-depth detail.
Power Up Modes and Secondary Functions
In addition to the functions directly controlled by the knobs and switches on the UI, it is possible to configure global setup modes and access additional functions
via power up modes and secondary functions. See complete manual for in-depth detail.
+
Preset 1 Preset 2 Preset 3 Preset 4
AUDIO AND CV INPUTS (QUICK REFERENCE)
JACK NAME
LEFT IN / RIGHT IN
LEFT OUT / RIGHT OUT
INFINITE
IN GATE
IN GATE (Karplus-Strong)
FAVORITE
SHIMMER
INTERVAL
HIGH DAMP
GLIMMER
LFO CLK IN
SPEED
DEPTH
EXT LFO IN
TAP/TRIG
TAP/TRIG (Karplus-Strong)
ECHO ON
FEEDBACK
CLEAR
DECAY
WET
SIZE/PITCH
SIZE/PITCH (Karplus-Strong)
VOLTAGE RANGE
+/-10V (20Vpp)
+/-10V (20Vpp)
0-5V
0-5V
0-5V
0-5V
+/-5V
+/-5V
+/-5V
+/-5V
Rising edge triggered
+/-5V
+/-5V
+/-5V
Rising edge triggered
Rising edge triggered
0-5V
+/-5V
Rising edge triggered
+/-5V
+/-5V
+/-2V
0-4V
DESCRIPTION
Left and Right audio inputs. Use LEFT IN for mono input.
Left and Right audio outputs. Use LEFT OUT for mono output.
Engages the infinite effect to hold the input signal going into the reverb. Rising edge trigger will toggle the
state. Can be set to momentary response by pressing and holding HIGH BAND button at power-up. Set to
latching response by default.
Gates the input to the reverb when CV is high. Blue INPUT GAIN LED indicates audio input is gated and not
sent to the reverb. Can be set to latching response by pressing and holding REGEN button at power-up. Set
to momentary response by default.
Continuously excites or ‘bows’ the string in latching or momentary operation. See complete manual for
in-depth detail.
Toggles between the physical knob/switch settings of the module and the selected Favorite preset setting
on rising edge.
Sets shimmer gain. Knob position acts as an offset.
Sets pitch interval for shimmer. Quantized to 1/2 steps over +/- 1 octave range.
Affects the wet signal high end filtering. Positive voltage opens filter. Knob position acts as an offset.
Sets glimmer gain. Knob position acts as offset.
Sets the LFO speed to sync with phase-alignment to the clock input. SPEED knob acts as clock div/mult.
Sets LFO speed. Knob position acts as offset.
Sets LFO depth. Knob position acts as offset.
External LFO input. DEPTH knob acts as attenuverter.
Sets the delay time with clock CV input. DELAY/TUNE knob acts as clock mult/div. Clock min 25ms, clock max 3s.
Triggers or ‘plucks’ the string on rising edge transition.
Busses the delay output to the WET output to mix with the reverb signal.
Affects delay feedback or Karplus-Strong string decay/resonance. Knob position acts as offset.
Clears audio data from reverb buffer when rising edge detected.
Affects reverb decay length. Knob position acts as offset.
Affects wet output signal level. Knob position acts as offset.
1V/octave 0V = No size/pitch change. -2V = 2 octaves down. +2V = 2 octaves up. SIZE/PITCH knob acts as offset.
Tunes string to a range of 4 octaves over 4V at 1V/octave. DELAY/TUNE knob acts as fine tune control over
1 octave range.
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