Ritual Electronics Altar Manuel utilisateur
Ritual Electronics
Altar
2
Summary
03................Warranty
04................Installation
05................Overview
06................Controls
07................Character
08.................Color
09................1V/Oct
10................Self patching
11................Patch ideas
3
Altar
Thank you for purchasing Ritual Electronics Altar.
Your module has been assembled with care in our
studio in Marseille, France.
You can find your module on Modulargrid:
https://www.modulargrid.net/e/ritual-electronics-altar
For any remarks and informations, contact us at:
For video demos and patch ideas check:
https://www.instagram.com/ritualelectronics/
https://www.youtube.com/c/ritualelectronics
Limited warranty
Ritual Electronics warrants this product to be free of defects in
materials or construction for a period of one year from the date of
purchase.
Malfunction resulting from wrong power supply voltages, backwards
or reversed eurorack bus board cable connection, abuse of the
product or any other causes determined by Ritual Electronics to be
the fault of the user are not covered by this warranty, and normal
service rates will apply.
During the warranty period, any defective products will be repaired
or replaced, at the option of Ritual Electronics, on a return-to-Ritual
Electronics basis with the customer paying the transit cost to Ritual
Electronics. The return of your module is on us.
Ritual Electronics implies and accepts no responsibility for harm to
person or apparatus caused through operation of this product.
4
Installation
Always turn your eurorack case off before plugging
or unplugging a module.
Do not touch any electrical terminals when attaching any
Eurorack bus board cable.
Ritual Electronics Altar requires:
35mA on +12V
30mA on -12V
0mA on +5V
You will need 12HP of free space in your Eurorack case to
install Altar. The module is 25mm deep.
Connect the included ribbon cable to the module. Connect the
other end of the cable to the bus board connector of your case.
5
Overview
Altar is a modern voltage controlled 3-pole, 18dB/
octave state variable filter.
The configuration of the filter can be smoothly crossfaded
from BP to LP to HP. This unusual filter type arrangement
brings out very nice harmonics and nuances. It is really
suited for CV control.
Resonance is under voltage control with attenuverter as
well allowing for great timbre modulations. It is particularly
useful to recreate accent patterns à la 303.
There is a gain at Altar’s input to beef up your signal which
then distort the filter core.
The filter tracks 1V/oct for 4-5 octaves and can turn into a
very sweet sine oscillator.
Altar is a completely original filter design by Mathieu
Fröhlich (creator of Squarp’s Hermod).
6
Frequency knob
Sets the cutoff
From sub-audio (≈2.5Hz anti clockwise)
to ultrasonic (43.5kHz fully clockwise)
Frequency attenuverter knob
Going left the CV input is subtracted
from the Frequency knob value. To the
right the CV input is added.
Resonance
Controls the resonance peak
Gain knob
Attenuate or amplify the input to
generate different filter responses
Out
Outputs filtered signal
Color & Res[onance] CV inputs
External control for each parameter
Audio input
Usually everything starts here
Color knob
Changes the state of the filter from
band-pass to low-pass to high-pass
Color & Resonance attenuverter knobs
Going left the CV input is subtracted
from the Color/Resonance knob value.
To the right the CV input is added.
Altar controls
1V/Oct
Use the 1V/Oct calibrated input for
pitch tracking
Freq[uency] CV input
External control for the filter frequency
7
Character
Patched very simply Altar is a relatively smooth
filter. It is not what you would expect from a noise
worshipping company.
If you keep the gain relatively low, crank the
resonance up a bit, you’ll find throat singing like
harmonic series hidden in the simplest square waves.
One of the filter’s quirks is the frequency range. It
goes from sub audio (2.5Hz) when all the way down
to ultra sonic (43.5kHz) when all the way up. Keep
this in mind while experimenting.
The resonance stays in control and only self oscillates
at the very last degrees of the pot. This way you can
get nuanced frequency bumps!
If you want to unlock wilder timbres, self patching
and audio rate modulations are your friends, as
usual. More on this in the following pages.
Do not underestimate the gain knob. Its neutral
position is around 2 o’clock.
This very knob changes the character of the filter
quite a lot. Specially for resonance.
Be aware that less gain can result in less than the
standard 10Vpp waveform. But it’s worth exploring
these sounds too!
8
Colors
The Color act as a three input crossfader.
It transitions smoothly from band-pass to low-pass to high-pass.
This unusual BP-LP-HP filter arrangement is very suited for voltage controlled
transition giving a more pleasant sweep than the usual LP-BP-HP.
9
1V/Oct
Altar’s 1V/Oct input allows for filter tracking and
sine oscillator functionality.
It tracks over 4-5 octaves. You can adjust the tracking
using the onboard vertical trimmer, located on the
right side of the PCB.
Calibration procedure
You’ll need a way to measure frequency. The
spectrum analyzer or tuner in your DAW can help
you if you don’t have an oscilloscope or a multimeter.
Patch a stable 1V/Oct source in the input and play
octaves. If the upper octaves are flat, turn the trimmer
clockwise. If they are sharp, turn counter clockwise.
Usually the knob fully clockwise has given the best
results!
10
Self patching
New tones can be unlocked by patching the input or
the output of the filter to its different CV inputs.
As all our modules, Altar shines when self patched.
Try patching its output in the Colour input to add
thickness to the sound.
Use multiples and stackcables and experiment!
Auto oscillation self patching trick
Altar does not provide a 10Vpp sine across the
whole frequency range when oscillating. You can
however patch the output in the input to get a higher
output. Prefer the low pass mode for such use and
ride the gain. Careful, in band-pass you can go as
high as 22Vpp using this technique!
See Patch Idea #2 on page 12 for more.
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