Lush Projects LushOne Inca User manual

LushOne Inca Synth Module
Introduction, Joystick, Signal Processing
Joystick

2 LushOne 301 –LushOne Inca
Inca - Introduction
•Additional module to the LushOne base
–Joystick controller
–New ways to combine signals
–Percussive and random effects
–Scores of new patches when used as a second or third module in a
LushOne system
•Signal mixer and voltage processor
–Mix or modify signals by summing, scaling and offsetting
•Noise source
–Random voltage source and percussive sound
•Sample and Hold
–Capture and hold voltage levels from clock
•Low Frequency Oscillator (LFO)
•Analogue thumbstick with switch
•3.5mm mono Break-in/Breakout

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LushOne Inca layout and controls
Joystick
= 2mm banana plug patch connector
Mixer/Signal Processor LFO
Sample and Hold
Break-In/
Breakout
3.5mm mono jack socket
Joystick
Noise Source

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In this teaching module
Joystick
•Using the joystick
•Using one input of the mixer as a signal processor to manipulate a
control voltage (CV)

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Joystick
•Fun way to “perform” by
manipulating two control voltages
•X Out and Y Out go from 0V to +5V
based on the joystick position
•Button Out goes from
0V (joystick not pressed) to
+5V (joystick pressed)
•Connect through the Mixer/Signal
Processor to change range of
polarity of outputs
•The joystick makes me smile
Joystick

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Joystick patch
Oscillator 1
(OSC1)
OSC1 Out
Gate Logic
Filter
VCF In
CV1 In
Gate In
5V
Inca Module
LushOne Base Module
Oscillator 2
(OSC2)
Set to “Norm” and “CV-H” mode
CV2 In
OSC2 Out
Joystick
X Out
Y Out
OSC2
CV In
OSC1
CV In
LFO
Square
Out
“Gate In” can be connected to one of:
1) 5V for continuous operation
2) Button Out for control by Joystick
3) LFO Square Out for regular beats
Button Out

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Joystick Patch
•Patch the system and adjust
the settings as shown
•Twiddle joystick to get wide
range of weird sounds
•Try different wave shapes
•Try connecting the “Gate In” to
other sources:
–“Button Out” on the joystick –
press joystick for sound
–“Square Out” on Inca LFO for
repeating bursts
Joystick
Adjust for some
“bite”
Twiddle joystick
No keyboard
needed!

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CV processing with the mixer/signal processor
•The current patch gives the joystick control over
the full range of both oscillators
•What if you wanted to reduce the range of
OSC1 so you got finer control?
•Using the Mixer/Signal Processor as a signal
processor you can manipulate control voltages
to:
–Control the gain
–Add or subtract a voltage offset
–Invert the polarity of a signal
Or any combination!

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CV Processing Configuration
•To manipulate a CV connect it to
one input
–Use a non-inverting or inverting
input
•An inverting input will create an
output voltage that reduces as the
input voltage increases
–Any of the non-inverting or
inverting inputs can be used
•Typically you want a control voltage
output to use the DC (Direct
Current) output
–DC out preserves the absolute level
of the signal and allows you to add
offsets
–Allows control voltages between 0V
and 5V
–AC output will go negative
•Use the two LEDs to monitor the
output voltage (see next slide)
Non-
Inverting
CV Input
CV
Output
LEDs for
level
indication

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Mixer/Signal Processor –Signal level LEDs
•LEDs light up when DC output voltage is
positive (upper LED), or
negative (lower LED)
•LED brightness goes from dim (near 0V) to
bright (at 5V)
•DC signals will cause steady lights
Slow AC signals will cause flickering lights
Fast AC signals will cause steady lights
again (due to persistence of vision hiding
the fast flicker)
•With practice you will learn to infer the
signal behaviour from the pattern of the
lights
DC Out = +1V
DC Out = +5V
DC Out = -1V
DC Out = 0V
DC Out = -5V

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Signal processor demo •Set up as shown
•If you have a volt meter you can connect
to the “DC Out” to see the actual voltage
–If you don’t have a meter just use the LEDs
•Turn the gain to “min” and then adjust the
offset
–You should see the output vary from about
-5V to +5V
–Note that the input has no effect if the
gain is at minimum (gain = 0)
•Set the DC offset to the centre (0V)
–Adjust the gain while moving the joystick
up and down to vary the input
–Note that unity gain is approximately 1/3rd
round the travel of the gain control
–Maximum gain is about x 3
•Observe how the offset and gain controls
can be used together to set the absolute
voltage and the range of adjustment of
the CV
–For non-inverting inputs:
Vout = (Gain x Vin) + Offset
–For inverting inputs:
Vout = - (Gain x Vin) + Offset
Joystick
Min
Gain = 0
Max
Gain = 3
Gain ≈ 1
Min
Add -5V
Max
Add +5V
Centre
Add 0V
VDC Out = (Gain x VIn)+ Offset

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Mixer/Signal Process output voltages
•Output of Mixer/Signal Processor is clipped to about 1V above/below the power supply voltage
•Still, output can easily exceed the guaranteed safe input range for CVs
–OSC1/OSC2 CV inputs are particularly sensitive because the feed the AVR Microcontroller
•For safe operation:
1. Connect input(s) to mixer but start with DC Out disconnected
2. Start with very low gain
3. Adjust the DC Offset to put the voltage in the safe range (use a meter or LEDs to assess)
4. Make connection from DC Out to the CV in
5. Increase the gain in small steps until you are happy. After each step adjust the DC Offset as necessary
•Keep a short eye on the LEDs –in particular watch for the negative LED lighting up!
•Some inputs (eg CV in to the filter) are not too sensitive about the voltage in and can be more
freely used.
0V
+8V
-8V
+5V Guaranteed safe range for
LushOne CV inputs
(Particularly OSC1/OSC2 CV in)
Take care not to
overload CV inputs!
Range of output
voltages from
Mixer/Signal
Processor
Danger Zone!
Danger Zone!

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Apply the signal processor to the Joystick patch
•Patch as shown, except for
the yellow wire going to OSC1
CV In
•Set the DC Offset slightly
above centre
•Set the Gain on the signal
processor low
•Check that DC Out stays
within range 0V to 5V as you
move the joystick left and
right
–Bottom LED should not light
–Adjust DC Offset or Gain if
needed
•Add patch lead to OSC1 CV In
•Follow procedure on previous
slide to progressively adjust
the Signal Processor Controls
to get a range of effects you
like while keeping within the
allowed voltages
Joystick
Adjust for some
“bite”
Twiddle joystick
Make this connection
after adjusting the Signal Processor

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That’s all folks
•Have fun messing around with the joystick
•Use the signal processor to change responses to
control voltages
•Don’t forget if you also have a contour you can
invent patches involving all three modules
•Next time:
–Using the Mixer to combine signals
–Interconnecting external signals